Latest stable kernel upgrade breaks Qt 5.12 with EGLFS on FKMS

Start by reproducing the failure with the reported Linux 5.4.51 kernel, Raspberry Pi 3B+, Qt 5.12.6, EGLFS, and FKMS, then inspect the reported DRM page-flip and atomic-KMS timeout messages. Done means Qt applications continue rendering instead of showing a black display or timing out.

Describe the bug
After upgrading to the new kernel, our application stopped working. The display remained black, and Qt was showing thousands of lines like:

     2.216 unknown:0 critical Could not queue DRM page flip on screen HDMI1 (Invalid argument)

When setting Qt to use atomic KMS, the application stops working after some random amount of time, with the following message in kernel:

[  701.916447] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:74:crtc-2] flip_done timed out

To reproduce
Upgrade to latest kernel, using a Qt 5.12.6 app built with EGLFS support and FKMS.

Expected behaviour
Qt apps keep working

Actual behaviour
Qt apps break

System
raspinfo output with atomic KMS:

System Information
------------------

Raspberry Pi 3 Model B Plus Rev 1.3
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"

Raspberry Pi reference 2020-05-27
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 825107f04027269db77426046f5085475b1ea22f, stage2

Linux raspberrypi 5.4.51-v7+ #1326 SMP Fri Jul 17 10:45:25 BST 2020 armv7l GNU/Linux
Revision        : a020d3
Serial          : 0000000035ba5f2d
Model           : Raspberry Pi 3 Model B Plus Rev 1.3
Throttled flag  : throttled=0x0
Camera          : supported=0 detected=0

Videocore information
---------------------

Jul 17 2020 11:04:27 
Copyright (c) 2012 Broadcom
version 21a15cb094f41c7506ad65d2cb9b29c550693057 (clean) (release) (start)

alloc failures:     0
compactions:        0
legacy block fails: 0

Filesystem information
----------------------
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root       15022716 1966892  12413488  14% /
devtmpfs          342740       0    342740   0% /dev
tmpfs             474324       0    474324   0% /dev/shm
tmpfs             474324   12364    461960   3% /run
tmpfs               5120       4      5116   1% /run/lock
tmpfs             474324       0    474324   0% /sys/fs/cgroup
/dev/mmcblk0p1    258095   54459    203636  22% /boot
tmpfs              94864       0     94864   0% /run/user/1000

Filename                                Type            Size    Used    Priority
/var/swap                               file            102396  0       -2

Package version information
---------------------------
raspberrypi-ui-mods:
  Installed: (none)
raspberrypi-sys-mods:
  Installed: 20200514
openbox:
  Installed: (none)
lxpanel:
  Installed: (none)
pcmanfm:
  Installed: (none)
rpd-plym-splash:
  Installed: (none)

Networking Information
----------------------

eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether m.m.m.m  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet x.x.x.x  netmask x.x.x.x
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet x.x.x.x  netmask x.x.x.x  destination x.x.x.x
        inet6 y::y.y.y.y  prefixlen 64  scopeid 0x20<link>
        inet6 2001:bc8:2195:y::y.y.y.y  prefixlen 64  scopeid 0x0<global>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 816  bytes 71050 (69.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 961  bytes 426662 (416.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet x.x.x.x  netmask x.x.x.x  broadcast x.x.x.x
        inet6 y::y.y.y.y  prefixlen 64  scopeid 0x20<link>
        ether m.m.m.m  txqueuelen 1000  (Ethernet)
        RX packets 2694  bytes 319932 (312.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1669  bytes 639167 (624.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


USB Information
---------------

/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/3p, 480M
            |__ Port 2: Dev 12, If 0, Class=Human Interface Device, Driver=usbhid, 12M
            |__ Port 3: Dev 7, If 0, Class=Hub, Driver=hub/4p, 480M
            |__ Port 1: Dev 8, If 0, Class=Vendor Specific Class, Driver=lan78xx, 480M
        |__ Port 2: Dev 13, If 0, Class=Printer, Driver=usblp, 12M
        |__ Port 3: Dev 14, If 0, Class=Hub, Driver=hub/4p, 480M
            |__ Port 1: Dev 15, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            |__ Port 1: Dev 15, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M

config.txt
----------

aphy_params_current=819
arm_freq=1400
audio_pwm_mode=514
config_hdmi_boost=5
core_freq=400
desired_osc_freq=0x331df0
desired_osc_freq_boost=0x3c45b0
disable_commandline_tags=2
disable_l2cache=1
display_hdmi_rotate=-1
display_lcd_rotate=-1
dphy_params_current=547
enable_tvout=1
force_eeprom_read=1
force_pwm_open=1
framebuffer_ignore_alpha=1
framebuffer_swap=1
gpu_freq=300
init_uart_clock=0x2dc6c00
lcd_framerate=60
mask_gpu_interrupt0=3072
mask_gpu_interrupt1=26370
over_voltage_avs=50000
over_voltage_avs_boost=0x2625a
pause_burst_frames=1
program_serial_random=1
sdram_freq=450
total_mem=1024
hdmi_force_cec_address:0=65535
hdmi_force_cec_address:1=65535
hdmi_pixel_freq_limit:0=0x9a7ec80
device_tree=-
overlay_prefix=overlays/
hdmi_cvt:0=
hdmi_cvt:1=
hdmi_edid_filename:0=
hdmi_edid_filename:1=
hdmi_timings:0=
hdmi_timings:1=

cmdline.txt
-----------
coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 video=HDMI-A-1:640x480M@60 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  video=HDMI-A-1:1024x600 quiet console=ttyS0,115200 console=tty1 root=PARTUUID=6f89ca26-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

raspi-gpio settings
-------------------

BANK0 (GPIO 0 to 27):
GPIO 0: level=1 fsel=0 func=INPUT
GPIO 1: level=1 fsel=0 func=INPUT
GPIO 2: level=1 fsel=4 alt=0 func=SDA1
GPIO 3: level=1 fsel=4 alt=0 func=SCL1
GPIO 4: level=1 fsel=0 func=INPUT
GPIO 5: level=1 fsel=0 func=INPUT
GPIO 6: level=1 fsel=0 func=INPUT
GPIO 7: level=1 fsel=0 func=INPUT
GPIO 8: level=1 fsel=0 func=INPUT
GPIO 9: level=0 fsel=0 func=INPUT
GPIO 10: level=0 fsel=0 func=INPUT
GPIO 11: level=0 fsel=0 func=INPUT
GPIO 12: level=0 fsel=0 func=INPUT
GPIO 13: level=0 fsel=0 func=INPUT
GPIO 14: level=0 fsel=0 func=INPUT
GPIO 15: level=1 fsel=0 func=INPUT
GPIO 16: level=0 fsel=0 func=INPUT
GPIO 17: level=0 fsel=0 func=INPUT
GPIO 18: level=0 fsel=0 func=INPUT
GPIO 19: level=0 fsel=0 func=INPUT
GPIO 20: level=0 fsel=0 func=INPUT
GPIO 21: level=0 fsel=0 func=INPUT
GPIO 22: level=0 fsel=0 func=INPUT
GPIO 23: level=0 fsel=0 func=INPUT
GPIO 24: level=0 fsel=0 func=INPUT
GPIO 25: level=0 fsel=0 func=INPUT
GPIO 26: level=0 fsel=0 func=INPUT
GPIO 27: level=0 fsel=0 func=INPUT
BANK1 (GPIO 28 to 45):
GPIO 28: level=0 fsel=0 func=INPUT
GPIO 29: level=0 fsel=1 func=OUTPUT
GPIO 30: level=1 fsel=7 alt=3 func=CTS0
GPIO 31: level=1 fsel=7 alt=3 func=RTS0
GPIO 32: level=1 fsel=7 alt=3 func=TXD0
GPIO 33: level=1 fsel=7 alt=3 func=RXD0
GPIO 34: level=0 fsel=7 alt=3 func=SD1_CLK
GPIO 35: level=1 fsel=7 alt=3 func=SD1_CMD
GPIO 36: level=1 fsel=7 alt=3 func=SD1_DAT0
GPIO 37: level=1 fsel=7 alt=3 func=SD1_DAT1
GPIO 38: level=1 fsel=7 alt=3 func=SD1_DAT2
GPIO 39: level=1 fsel=7 alt=3 func=SD1_DAT3
GPIO 40: level=0 fsel=4 alt=0 func=PWM0
GPIO 41: level=0 fsel=4 alt=0 func=PWM1
GPIO 42: level=0 fsel=4 alt=0 func=GPCLK1
GPIO 43: level=1 fsel=4 alt=0 func=GPCLK2
GPIO 44: level=1 fsel=0 func=INPUT
GPIO 45: level=1 fsel=0 func=INPUT
BANK2 (GPIO 46 to 53):
GPIO 46: level=1 fsel=0 func=INPUT
GPIO 47: level=1 fsel=1 func=OUTPUT
GPIO 48: level=0 fsel=4 alt=0 func=SD0_CLK
GPIO 49: level=1 fsel=4 alt=0 func=SD0_CMD
GPIO 50: level=1 fsel=4 alt=0 func=SD0_DAT0
GPIO 51: level=1 fsel=4 alt=0 func=SD0_DAT1
GPIO 52: level=1 fsel=4 alt=0 func=SD0_DAT2
GPIO 53: level=1 fsel=4 alt=0 func=SD0_DAT3

vcdbg log messages
------------------

Failed to allocate -505734863 bytes for message buffer

dmesg log
---------

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.4.51-v7+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1326 SMP Fri Jul 17 10:45:25 BST 2020
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Plus Rev 1.3
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] Reserved memory: created CMA memory pool at 0x1ec00000, size 256 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[    0.000000] On node 0 totalpages: 242688
[    0.000000]   Normal zone: 1896 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 242688 pages, LIFO batch:63
[    0.000000] percpu: Embedded 20 pages/cpu s49792 r8192 d23936 u81920
[    0.000000] pcpu-alloc: s49792 r8192 d23936 u81920 alloc=20*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 240792
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 video=HDMI-A-1:640x480M@60 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  video=HDMI-A-1:1024x600 quiet console=ttyS0,115200 console=tty1 root=PARTUUID=6f89ca26-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 685480K/970752K available (8192K kernel code, 681K rwdata, 2532K rodata, 1024K init, 824K bss, 23128K reserved, 262144K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 27966 entries in 55 pages
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] random: get_random_bytes called from start_kernel+0x328/0x4e8 with crng_init=0
[    0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000006] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000018] Switching to timer-based delay loop, resolution 52ns
[    0.000279] Console: colour dummy device 80x30
[    0.000305] printk: console [tty1] enabled
[    0.000355] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.000374] pid_max: default: 32768 minimum: 301
[    0.000702] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.000723] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.001875] CPU: Testing write buffer coherency: ok
[    0.002428] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.003368] Setting up static identity map for 0x100000 - 0x10003c
[    0.003565] rcu: Hierarchical SRCU implementation.
[    0.004247] smp: Bringing up secondary CPUs ...
[    0.005370] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.006637] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.007804] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.007955] smp: Brought up 1 node, 4 CPUs
[    0.007970] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.007980] CPU: All CPU(s) started in HYP mode.
[    0.007989] CPU: Virtualization extensions available.
[    0.008934] devtmpfs: initialized
[    0.025515] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.025789] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.025816] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
[    0.036739] pinctrl core: initialized pinctrl subsystem
[    0.037879] NET: Registered protocol family 16
[    0.042165] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.048369] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.048381] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.048609] Serial: AMBA PL011 UART driver
[    0.051117] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.080151] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-07-17 11:04, variant start
[    0.090163] raspberrypi-firmware soc:firmware: Firmware hash is 21a15cb094f41c7506ad65d2cb9b29c550693057
[    0.140527] bcm2835-dma 3f007000.dma: DMA legacy API manager, dmachans=0x1
[    0.142720] SCSI subsystem initialized
[    0.142986] usbcore: registered new interface driver usbfs
[    0.143060] usbcore: registered new interface driver hub
[    0.143189] usbcore: registered new device driver usb
[    0.145157] clocksource: Switched to clocksource arch_sys_counter
[    1.301802] VFS: Disk quotas dquot_6.6.0
[    1.301923] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    1.302105] FS-Cache: Loaded
[    1.302336] CacheFiles: Loaded
[    1.303090] simple-framebuffer 3eace000.framebuffer: framebuffer at 0x3eace000, 0x12c000 bytes, mapped to 0x(ptrval)
[    1.303108] simple-framebuffer 3eace000.framebuffer: format=a8r8g8b8, mode=640x480x32, linelength=2560
[    1.303582] Console: switching to colour frame buffer device 80x30
[    1.308681] simple-framebuffer 3eace000.framebuffer: fb0: simplefb registered!
[    1.317950] thermal_sys: Registered thermal governor 'step_wise'
[    1.318349] NET: Registered protocol family 2
[    1.319273] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[    1.319313] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    1.319428] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    1.319617] TCP: Hash tables configured (established 8192 bind 8192)
[    1.319786] UDP hash table entries: 512 (order: 2, 16384 bytes, linear)
[    1.319838] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear)
[    1.320139] NET: Registered protocol family 1
[    1.320916] RPC: Registered named UNIX socket transport module.
[    1.320926] RPC: Registered udp transport module.
[    1.320936] RPC: Registered tcp transport module.
[    1.320946] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    1.322773] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[    1.326138] Initialise system trusted keyrings
[    1.326387] workingset: timestamp_bits=30 max_order=18 bucket_order=0
[    1.336928] FS-Cache: Netfs 'nfs' registered for caching
[    1.337594] NFS: Registering the id_resolver key type
[    1.337650] Key type id_resolver registered
[    1.337661] Key type id_legacy registered
[    1.337681] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    1.338935] Key type asymmetric registered
[    1.338947] Asymmetric key parser 'x509' registered
[    1.338999] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
[    1.339011] io scheduler mq-deadline registered
[    1.339022] io scheduler kyber registered
[    1.348272] bcm2835-rng 3f104000.rng: hwrng registered
[    1.348901] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    1.349632] vc-sm: Videocore shared memory driver
[    1.350169] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    1.361831] brd: module loaded
[    1.373525] loop: module loaded
[    1.374913] Loading iSCSI transport class v2.0-870.
[    1.375856] libphy: Fixed MDIO Bus: probed
[    1.375966] usbcore: registered new interface driver lan78xx
[    1.376030] usbcore: registered new interface driver smsc95xx
[    1.376050] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    1.376334] dwc_otg: FIQ enabled
[    1.376343] dwc_otg: NAK holdoff enabled
[    1.376352] dwc_otg: FIQ split-transaction FSM enabled
[    1.376365] Module dwc_common_port init
[    1.376614] usbcore: registered new interface driver usb-storage
[    1.376829] mousedev: PS/2 mouse device common for all mice
[    1.378373] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[    1.379707] cpufreq: cpufreq_online: CPU0: Running at unlisted freq: 600000 KHz
[    1.381476] cpufreq: cpufreq_online: CPU0: Unlisted initial frequency changed to: 700000 KHz
[    1.382154] sdhci: Secure Digital Host Controller Interface driver
[    1.382162] sdhci: Copyright(c) Pierre Ossman
[    1.382672] mmc-bcm2835 3f300000.mmcnr: could not get clk, deferring probe
[    1.383182] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe
[    1.383404] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.385113] ledtrig-cpu: registered to indicate activity on CPUs
[    1.385475] hidraw: raw HID events driver (C) Jiri Kosina
[    1.385607] usbcore: registered new interface driver usbhid
[    1.385615] usbhid: USB HID core driver
[    1.386993] vchiq: vchiq_init_state: slot_zero = (ptrval)
[    1.388545] [vc_sm_connected_init]: start
[    1.592519] [vc_sm_connected_init]: end - returning 0
[    1.594054] Initializing XFRM netlink socket
[    1.594085] NET: Registered protocol family 17
[    1.594194] Key type dns_resolver registered
[    1.594800] Registering SWP/SWPB emulation handler
[    1.595078] registered taskstats version 1
[    1.595097] Loading compiled-in X.509 certificates
[    1.595571] Key type ._fscrypt registered
[    1.595580] Key type .fscrypt registered
[    1.604545] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    1.604635] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2
[    1.606419] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver
[    1.607735] mmc-bcm2835 3f300000.mmcnr: mmc_debug:0 mmc_debug2:0
[    1.607747] mmc-bcm2835 3f300000.mmcnr: DMA channel allocated
[    1.634022] sdhost: log_buf @ (ptrval) (ded43000)
[    1.669994] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[    1.671618] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    1.673241] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    1.676148] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[    1.683580] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    1.685745] of_cfs_init
[    1.685862] of_cfs_init: OK
[    1.706824] Waiting for root device PARTUUID=6f89ca26-02...
[    1.748269] random: fast init done
[    1.761755] mmc1: new high speed SDIO card at address 0001
[    1.774920] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.779247] mmc0: new high speed SDHC card at address aaaa
[    1.779991] mmcblk0: mmc0:aaaa SB16G 14.8 GiB
[    1.783103]  mmcblk0: p1 p2
[    1.808960] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    1.809032] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[    1.817448] devtmpfs: mounted
[    1.823306] Freeing unused kernel memory: 1024K
[    1.835512] Run /sbin/init as init process
[    2.481972] systemd[1]: System time before build time, advancing clock.
[    2.638299] NET: Registered protocol family 10
[    2.639487] Segment Routing with IPv6
[    2.674501] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[    2.675485] systemd[1]: Detected architecture arm.
[    2.738994] systemd[1]: Set hostname to <raspberrypi>.
[    3.535120] random: systemd: uninitialized urandom read (16 bytes read)
[    3.548883] random: systemd: uninitialized urandom read (16 bytes read)
[    3.549495] systemd[1]: Listening on fsck to fsckd communication Socket.
[    3.550096] random: systemd: uninitialized urandom read (16 bytes read)
[    3.558403] systemd[1]: Listening on Syslog Socket.
[    3.560045] systemd[1]: Created slice User and Session Slice.
[    3.560614] systemd[1]: Listening on udev Kernel Socket.
[    3.562476] systemd[1]: Created slice system-openvpn.slice.
[    3.563508] systemd[1]: Created slice system-getty.slice.
[    3.563886] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.
[    4.095598] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[    4.190470] systemd-journald[104]: Received request to flush runtime journal from PID 1
[    4.714962] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
[    4.718425] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[    4.718447] [vc_sm_connected_init]: start
[    4.720070] [vc_sm_connected_init]: installed successfully
[    4.734617] mc: Linux media interface: v0.10
[    4.778158] videodev: Linux video capture interface: v2.00
[    4.853546] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    4.857654] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    4.859143] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    4.859973] bcm2835_audio bcm2835_audio: card created with 8 channels
[    4.860222] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    4.866750] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
[    4.874673] bcm2835_isp: module is from the staging directory, the quality is unknown, you have been warned.
[    4.879466] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
[    4.891006] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[    4.891054] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
[    4.919667] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video13
[    4.920129] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video14
[    4.920654] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video15
[    4.921880] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video16
[    4.921968] bcm2835-isp bcm2835-isp: Register output node 0 with media controller
[    4.922052] bcm2835-isp bcm2835-isp: Register capture node 1 with media controller
[    4.923692] bcm2835-isp bcm2835-isp: Register capture node 2 with media controller
[    4.923770] bcm2835-isp bcm2835-isp: Register capture node 3 with media controller
[    4.924705] bcm2835-isp bcm2835-isp: Loaded V4L2 bcm2835-isp
[    4.982335] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[    4.982394] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
[    4.991550] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[    4.991594] bcm2835-codec bcm2835-codec: Loaded V4L2 isp
[    5.263743] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    5.484324] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    5.608276] brcmfmac: F1 signature read @0x18000000=0x15264345
[    5.625692] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    5.627012] usbcore: registered new interface driver brcmfmac
[    5.664820] dwc2 3f980000.usb: 3f980000.usb supply vusb_d not found, using dummy regulator
[    5.664975] dwc2 3f980000.usb: 3f980000.usb supply vusb_a not found, using dummy regulator
[    5.676842] debugfs: Directory '3f902000.hdmi' with parent 'vc4-hdmi' already present!
[    5.678731] vc4_hdmi 3f902000.hdmi: vc4-hdmi-hifi <-> 3f902000.hdmi mapping ok
[    5.690215] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,3-model-b-plus.txt failed with error -2
[    5.707897] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
[    5.708221] vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
[    5.708535] vc4-drm soc:gpu: bound 3f004000.txp (ops vc4_txp_ops [vc4])
[    5.708752] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4])
[    5.709033] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops [vc4])
[    5.709283] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops [vc4])
[    5.709553] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops [vc4])
[    5.709757] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
[    5.710717] checking generic (3eace000 12c000) vs hw (0 ffffffff)
[    5.710730] fb0: switching to vc4drmfb from simple
[    5.735580] Console: switching to colour dummy device 80x30
[    5.735660] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    5.735668] [drm] Driver supports precise vblank timestamp query.
[    5.751279] [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
[    5.786867] Console: switching to colour frame buffer device 128x37
[    5.810265] vc4-drm soc:gpu: fb0: vc4drmfb frame buffer device
[    5.886041] dwc2 3f980000.usb: EPs: 8, dedicated fifos, 4080 entries in SPRAM
[    5.889614] dwc2 3f980000.usb: DWC OTG Controller
[    5.889716] dwc2 3f980000.usb: new USB bus registered, assigned bus number 1
[    5.889824] dwc2 3f980000.usb: irq 33, io mem 0x3f980000
[    5.890423] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[    5.890453] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    5.890465] usb usb1: Product: DWC OTG Controller
[    5.890493] usb usb1: Manufacturer: Linux 5.4.51-v7+ dwc2_hsotg
[    5.890520] usb usb1: SerialNumber: 3f980000.usb
[    5.892100] hub 1-0:1.0: USB hub found
[    5.892269] hub 1-0:1.0: 1 port detected
[    5.940586] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    6.022958] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Mar  2 2020 23:30:41 version 7.45.202 (r724630 CY) FWID 01-72f6ece2
[    6.300072] rtc-pcf8523 1-0068: low voltage detected, time is unreliable
[    6.300452] rtc-pcf8523 1-0068: registered as rtc0
[    6.325262] usb 1-1: new high-speed USB device number 2 using dwc2
[    6.575602] usb 1-1: New USB device found, idVendor=0424, idProduct=2514, bcdDevice= b.b3
[    6.575628] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    6.576415] hub 1-1:1.0: USB hub found
[    6.576509] hub 1-1:1.0: 4 ports detected
[    6.905254] usb 1-1.1: new high-speed USB device number 3 using dwc2
[    7.035999] usb 1-1.1: New USB device found, idVendor=0424, idProduct=2514, bcdDevice= b.b3
[    7.036037] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    7.044086] hub 1-1.1:1.0: USB hub found
[    7.044230] hub 1-1.1:1.0: 3 ports detected
[    7.127475] rtc-pcf8523 1-0068: low voltage detected, time is unreliable
[    7.128154] rtc-pcf8523 1-0068: low voltage detected, time is unreliable
[    7.128819] rtc-pcf8523 1-0068: low voltage detected, time is unreliable
[    7.131849] random: crng init done
[    7.131881] random: 7 urandom warning(s) missed due to ratelimiting
[    7.157132] usb 1-1.3: new high-speed USB device number 4 using dwc2
[    7.287093] usb 1-1.3: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice=32.98
[    7.287113] usb 1-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[    7.287125] usb 1-1.3: Product: USB2.0 Hub
[    7.288165] hub 1-1.3:1.0: USB hub found
[    7.288597] hub 1-1.3:1.0: 4 ports detected
[    7.385613] usb 1-1.1.2: new full-speed USB device number 5 using dwc2
[    7.527543] usb 1-1.1.2: New USB device found, idVendor=0eef, idProduct=0005, bcdDevice= 2.00
[    7.527563] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    7.527575] usb 1-1.1.2: Product: WS170120
[    7.527587] usb 1-1.1.2: Manufacturer: WaveShare
96663G8477598] usb 1-1.1.2: SerialNumber: V
[    7.534117] 8021q: 802.1Q VLAN Support v1.8
[    7.543036] input: WaveShare WS170120 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0/0003:0EEF:0005.0001/input/input0
[    7.543485] hid-generic 0003:0EEF:0005.0001: input,hidraw0: USB HID v1.10 Device [WaveShare WS170120] on usb-3f980000.usb-1.1.2/input0
[    7.635271] usb 1-1.3.1: new low-speed USB device number 6 using dwc2
[    7.792948] usb 1-1.3.1: New USB device found, idVendor=04d9, idProduct=0006, bcdDevice= 1.40
[    7.792969] usb 1-1.3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    7.792981] usb 1-1.3.1: Product: RPI Wired Keyboard 2
[    7.792993] usb 1-1.3.1: Manufacturer:  
[    7.809296] input:   RPI Wired Keyboard 2 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.0/0003:04D9:0006.0002/input/input1
[    7.812534] input: WaveShare WS170120 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0/0003:0EEF:0005.0001/input/input2
[    7.865305] usb 1-1.1.3: new high-speed USB device number 7 using dwc2
[    7.877346] hid-generic 0003:04D9:0006.0002: input,hidraw0: USB HID v1.11 Keyboard [  RPI Wired Keyboard 2] on usb-3f980000.usb-1.3.1/input0
[    7.878739] hid-multitouch 0003:0EEF:0005.0001: input,hidraw1: USB HID v1.10 Device [WaveShare WS170120] on usb-3f980000.usb-1.1.2/input0
[    7.889792] input:   RPI Wired Keyboard 2 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.1/0003:04D9:0006.0003/input/input3
[    7.895879] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SSFS
[    7.955827] hid-generic 0003:04D9:0006.0003: input,hidraw2: USB HID v1.11 Device [  RPI Wired Keyboard 2] on usb-3f980000.usb-1.3.1/input1
[    7.974386] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[    7.997855] usb 1-1.1.3: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice=92.24
[    7.997869] usb 1-1.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    7.997875] usb 1-1.1.3: Product: USB2.0 Hub
[    7.997886] usb 1-1.1.3: Manufacturer: GenesysLogic
[    7.998602] hub 1-1.1.3:1.0: USB hub found
[    7.999035] hub 1-1.1.3:1.0: 4 ports detected
[    8.295224] usb 1-1.1.1: new high-speed USB device number 8 using dwc2
[    8.430083] usb 1-1.1.1: New USB device found, idVendor=0424, idProduct=7800, bcdDevice= 3.00
[    8.430095] usb 1-1.1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    8.625361] usb 1-1.2: new full-speed USB device number 9 using dwc2
[    8.697185] lan78xx 1-1.1.1:1.0 (unnamed net_device) (uninitialized): No External EEPROM. Setting MAC Speed
[    8.698705] libphy: lan78xx-mdiobus: probed
[    8.715427] lan78xx 1-1.1.1:1.0 (unnamed net_device) (uninitialized): int urb period 64
[    8.725254] usb 1-1.2: device descriptor read/64, error -32
[    8.878762] 8021q: adding VLAN 0 to HW filter on device eth0
[    8.945254] usb 1-1.2: device descriptor read/64, error -32
[    9.165177] usb 1-1.2: new full-speed USB device number 10 using dwc2
[    9.265212] usb 1-1.2: device descriptor read/64, error -32
[    9.485202] usb 1-1.2: device descriptor read/64, error -32
[    9.605338] usb 1-1-port2: attempt power cycle
[    9.610958] usb 1-1.3: clear tt 1 (9061) error -71
[    9.611054] usb 1-1.3: clear tt 1 (9062) error -71
[    9.618959] usb 1-1.3: clear tt 1 (9061) error -71
[    9.619054] usb 1-1.3: clear tt 1 (9062) error -71
[    9.626978] usb 1-1.3: clear tt 1 (9061) error -71
[    9.627089] usb 1-1.3: clear tt 1 (9062) error -71
[    9.665976] usb 1-1.3: clear tt 1 (9061) error -71
[    9.666068] usb 1-1.3: clear tt 1 (9062) error -71
[    9.673959] usb 1-1.3: clear tt 1 (9061) error -71
[    9.674054] usb 1-1.3: clear tt 1 (9062) error -71
[    9.681975] usb 1-1.3: clear tt 1 (9061) error -71
[    9.682078] usb 1-1.3: clear tt 1 (9062) error -71
[    9.715960] usb 1-1.3: clear tt 1 (9062) error -71
[    9.716054] usb 1-1.3: clear tt 1 (9061) error -71
[    9.723974] usb 1-1.3: clear tt 1 (9062) error -71
[    9.724060] usb 1-1.3: clear tt 1 (9061) error -71
[    9.731970] usb 1-1.3: clear tt 1 (9062) error -71
[    9.732054] usb 1-1.3: clear tt 1 (9061) error -71
[    9.795972] usb 1-1.3: clear tt 1 (9061) error -71
[    9.796062] usb 1-1.3: clear tt 1 (9062) error -71
[    9.803958] usb 1-1.3: clear tt 1 (9061) error -71
[    9.804082] usb 1-1.3: clear tt 1 (9062) error -71
[    9.811980] usb 1-1.3: clear tt 1 (9061) error -71
[    9.812054] usb 1-1.3: clear tt 1 (9062) error -71
[    9.845930] usb 1-1.1.2: USB disconnect, device number 5
[    9.925968] usb 1-1.3: clear tt 1 (9062) error -71
[    9.928058] usb 1-1.3: clear tt 1 (9061) error -71
[    9.933955] usb 1-1.3: clear tt 1 (9062) error -71
[    9.934054] usb 1-1.3: clear tt 1 (9061) error -71
[    9.941965] usb 1-1.3: clear tt 1 (9062) error -71
[    9.942053] usb 1-1.3: clear tt 1 (9061) error -71
[   10.055957] usb 1-1.3: clear tt 1 (9061) error -71
[   10.056054] usb 1-1.3: clear tt 1 (9062) error -71
[   10.063935] usb 1-1.3: clear tt 1 (9061) error -71
[   10.064052] usb 1-1.3: clear tt 1 (9062) error -71
[   10.071962] usb 1-1.3: clear tt 1 (9061) error -71
[   10.072055] usb 1-1.3: clear tt 1 (9062) error -71
[   10.185964] usb 1-1.3: clear tt 1 (9062) error -71
[   10.186061] usb 1-1.3: clear tt 1 (9061) error -71
[   10.193957] usb 1-1.3: clear tt 1 (9062) error -71
[   10.194055] usb 1-1.3: clear tt 1 (9061) error -71
[   10.201969] usb 1-1.3: clear tt 1 (9062) error -71
[   10.202054] usb 1-1.3: clear tt 1 (9061) error -71
[   10.265221] usb 1-1.2: new full-speed USB device number 11 using dwc2
[   10.325957] usb 1-1.3: clear tt 1 (9061) error -71
[   10.326053] usb 1-1.3: clear tt 1 (9062) error -71
[   10.333944] usb 1-1.3: clear tt 1 (9061) error -71
[   10.334053] usb 1-1.3: clear tt 1 (9062) error -71
[   10.341990] usb 1-1.3: clear tt 1 (9061) error -71
[   10.342073] usb 1-1.3: clear tt 1 (9062) error -71
[   10.465976] usb 1-1.3: clear tt 1 (9062) error -71
[   10.466063] usb 1-1.3: clear tt 1 (9061) error -71
[   10.473975] usb 1-1.3: clear tt 1 (9062) error -71
[   10.474098] usb 1-1.3: clear tt 1 (9061) error -71
[   10.482000] usb 1-1.3: clear tt 1 (9062) error -71
[   10.482195] usb 1-1.3: clear tt 1 (9061) error -71
[   10.595959] usb 1-1.3: clear tt 1 (9061) error -71
[   10.596053] usb 1-1.3: clear tt 1 (9062) error -71
[   10.603977] usb 1-1.3: clear tt 1 (9061) error -71
[   10.604075] usb 1-1.3: clear tt 1 (9062) error -71
[   10.611984] usb 1-1.3: clear tt 1 (9061) error -71
[   10.612071] usb 1-1.3: clear tt 1 (9062) error -71
[   10.705217] usb 1-1.2: device not accepting address 11, error -32
[   10.725969] usb 1-1.3: clear tt 1 (9062) error -71
[   10.726070] usb 1-1.3: clear tt 1 (9061) error -71
[   10.733951] usb 1-1.3: clear tt 1 (9062) error -71
[   10.734067] usb 1-1.3: clear tt 1 (9061) error -71
[   10.741989] usb 1-1.3: clear tt 1 (9062) error -71
[   10.815201] usb 1-1.2: new full-speed USB device number 13 using dwc2
[   10.864569] usb 1-1.2: New USB device found, idVendor=1d90, idProduct=20f0, bcdDevice= 0.02
[   10.864582] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   10.864591] usb 1-1.2: Product: Thermal Printer 
[   10.864600] usb 1-1.2: Manufacturer: CITIZEN
[   10.864608] usb 1-1.2: SerialNumber: 00000000
[   10.867952] usb 1-1.3: USB disconnect, device number 4
[   10.867971] usb 1-1.3.1: USB disconnect, device number 6
[   10.895562] usblp 1-1.2:1.0: usblp0: USB Bidirectional printer dev 13 if 0 alt 0 proto 2 vid 0x1D90 pid 0x20F0
[   10.899531] usbcore: registered new interface driver usblp
[   10.955238] usb 1-1.1.2: new full-speed USB device number 12 using dwc2
[   11.107019] usb 1-1.1.2: New USB device found, idVendor=0eef, idProduct=0005, bcdDevice= 2.00
[   11.107031] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   11.107037] usb 1-1.1.2: Product: WS170120
[   11.107043] usb 1-1.1.2: Manufacturer: WaveShare
96663G8477049] usb 1-1.1.2: SerialNumber: V
[   11.109974] input: WaveShare WS170120 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0/0003:0EEF:0005.0004/input/input4
[   11.357683] hid-multitouch 0003:0EEF:0005.0004: input,hidraw0: USB HID v1.10 Device [WaveShare WS170120] on usb-3f980000.usb-1.1.2/input0
[   11.775296] usb 1-1.3: new high-speed USB device number 14 using dwc2
[   11.906935] usb 1-1.3: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice=32.98
[   11.906946] usb 1-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[   11.906952] usb 1-1.3: Product: USB2.0 Hub
[   11.907705] hub 1-1.3:1.0: USB hub found
[   11.908058] hub 1-1.3:1.0: 4 ports detected
[   12.225238] usb 1-1.3.1: new low-speed USB device number 15 using dwc2
[   12.380192] usb 1-1.3.1: New USB device found, idVendor=04d9, idProduct=0006, bcdDevice= 1.40
[   12.380203] usb 1-1.3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   12.380210] usb 1-1.3.1: Product: RPI Wired Keyboard 2
[   12.380216] usb 1-1.3.1: Manufacturer:  
[   12.393747] input:   RPI Wired Keyboard 2 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.0/0003:04D9:0006.0005/input/input5
[   12.456961] hid-generic 0003:04D9:0006.0005: input,hidraw1: USB HID v1.11 Keyboard [  RPI Wired Keyboard 2] on usb-3f980000.usb-1.3.1/input0
[   12.470037] input:   RPI Wired Keyboard 2 as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.1/0003:04D9:0006.0006/input/input6
[   12.536062] hid-generic 0003:04D9:0006.0006: input,hidraw2: USB HID v1.11 Device [  RPI Wired Keyboard 2] on usb-3f980000.usb-1.3.1/input1
[   13.441274] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   22.260466] tun: Universal TUN/TAP device driver, 1.6
[   37.687846] rtc-pcf8523 1-0068: low voltage detected, time is unreliable
[  701.916447] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:74:crtc-2] flip_done timed out