RPi4: Dual HDMI display fails with vc4-kms-v3d-pi4 overlay

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#3,701 6 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
c, linux, raspberry-pi
Domain
computer-graphics, operating-systems

Research direction

Reproduce the failure on the listed RPi4 setup using /boot/config.txt, vc4-kms-v3d-pi4, and the two modetest commands for connectors 32 and 38. Start by examining the DRM crash and “Disabling IRQ #32” kernel output; done means both HDMI displays operate without a crash or subsequent modetest failures.

Written by the indexing model from the issue text.

Description

Describe the bug
Dual-TV display over HDMI doesn't work with vc4-kms-v3d-pi4 overlay on RPi4 (1GB version).

To reproduce
Connect 2 FHD HDMI TVs to RPi4, add "dtoverlay=vc4-kms-v3d-pi4" to config.txt, run rpi-update to switch to v5.4 kernel, "apt-get install libdrm-tests" to get modetest tool.

Then run:
modetest -Mvc4 -s 32:1920x1080 -v
[wait a while and press ENTER]
modetest -Mvc4 -s 38:1920x1080 -v
[wait a while and press ENTER]

DRM crashes and system runs slowly. Kernel dumps "Disabling IRQ #32" message. Futher runs of modetest tool fails.

System
2020-05-27-raspios-buster-lite-armhf.img + rpi-update to switch to v5.4 kernel.

  • Which model of Raspberry Pi? e.g. Pi3B+, PiZeroW
    Pi4
  • Which OS and version (cat /etc/rpi-issue)?
    Raspbian GNU/Linux 10
  • Which firmware version (vcgencmd version)?
    Jun 26 2020 14:48:17
    Copyright (c) 2012 Broadcom
    version b078012603a6a094178f959805996ad225a0d83b (clean) (release) (start)
  • Which kernel version (uname -a)?
    Linux raspberrypi 5.4.49-v7l+ #1323 SMP Fri Jun 26 14:40:18 BST 2020 armv7l GNU/Linux

Additional context
grep -v '#' /boot/config.txt | tr -s "\n"
dtparam=audio=on
[pi4]
dtoverlay=vc4-kms-v3d-pi4
[all]
enable_uart=1
core_freq_min=500

Logs
modetest -Mvc4 -c
Connectors:
id encoder status name size (mm) modes encoders
32 31 connected HDMI-A-1 1280x720 38 31
modes:
name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: preferred, driver
1920x1200 60 1920 2056 2256 2592 1200 1203 1209 1245 193476 flags: nhsync, pvsync; type: userdef
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74176 flags: phsync, pvsync, interlace; type: driver
1920x1080 50 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080 30 1920 2008 2052 2200 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 30 1920 2008 2052 2200 1080 1084 1089 1125 74176 flags: phsync, pvsync; type: driver
1920x1080 25 1920 2448 2492 2640 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74176 flags: phsync, pvsync; type: driver
1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
1360x768 60 1360 1424 1536 1792 768 771 777 795 85500 flags: phsync, pvsync; type: driver
1280x720 60 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
1280x720 60 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver
1280x720 50 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
1024x768 60 1024 1048 1184 1344 768 771 777 806 65000 flags: nhsync, nvsync; type: driver
800x600 60 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver
720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
720x576i 50 720 732 795 864 576 580 586 625 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x576i 50 720 732 795 864 576 580 586 625 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480 60 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13514 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13514 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
640x480 60 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
640x480 60 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
640x480 60 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff00410c000001010101
                    1c160103808048782ae692a3544a9926
                    0f4a4c21080081800101010101010101
                    010101010101023a801871382d40582c
                    450000d05200001e662150b051001b30
                    4070360076f23100001e000000fc0050
                    48494c4950530a2020202020000000fd
                    00303e0f4611000a2020202020200132
                    020333f152901f202221051404131203
                    1102160715060126097f05157f508301
                    00006c030c004000b82dc02e2e2e2ee3
                    050301023a801871382d40582c450000
                    d05200001e011d803e73382d407e2c45
                    8000d05200001e011d80d0721c162010
                    2c258000d05200009e011d8018711c16
                    20582c250000d05200009e0000000078
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:
    20 CRTC_ID:
            flags: object
            value: 65
    33 left margin:
            flags: range
            values: 0 100
            value: 0
    34 right margin:
            flags: range
            values: 0 100
            value: 0
    35 top margin:
            flags: range
            values: 0 100
            value: 0
    36 bottom margin:
            flags: range
            values: 0 100
            value: 0

38 37 connected HDMI-A-2 1280x720 37 37
modes:
name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: preferred, driver
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 74176 flags: phsync, pvsync, interlace; type: driver
1920x1080 50 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
1920x1080 30 1920 2008 2052 2200 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 30 1920 2008 2052 2200 1080 1084 1089 1125 74176 flags: phsync, pvsync; type: driver
1920x1080 25 1920 2448 2492 2640 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver
1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74176 flags: phsync, pvsync; type: driver
1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
1360x768 60 1360 1424 1536 1792 768 771 777 795 85500 flags: phsync, pvsync; type: driver
1280x720 60 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
1280x720 60 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver
1280x720 50 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
1024x768 60 1024 1048 1184 1344 768 771 777 806 65000 flags: nhsync, nvsync; type: driver
800x600 60 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver
720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
720x576i 50 720 732 795 864 576 580 586 625 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x576i 50 720 732 795 864 576 580 586 625 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480 60 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13514 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13514 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
720x480i 60 720 739 801 858 480 488 494 525 13500 flags: nhsync, nvsync, interlace, dblclk; type: driver
640x480 60 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
640x480 60 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
640x480 60 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff00410c000001010101
                    1c160103808048782ae692a3544a9926
                    0f4a4c21080081800101010101010101
                    010101010101023a801871382d40582c
                    450000d05200001e662150b051001b30
                    4070360076f23100001e000000fc0050
                    48494c4950530a2020202020000000fd
                    00303e0f4611000a2020202020200132
                    020333f152901f202221051404131203
                    1102160715060126097f05157f508301
                    00006c030c004000b82dc02e2e2e2ee3
                    050301023a801871382d40582c450000
                    d05200001e011d803e73382d407e2c45
                    8000d05200001e011d80d0721c162010
                    2c258000d05200009e011d8018711c16
                    20582c250000d05200009e0000000078
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:
    20 CRTC_ID:
            flags: object
            value: 72
    33 left margin:
            flags: range
            values: 0 100
            value: 0
    34 right margin:
            flags: range
            values: 0 100
            value: 0
    35 top margin:
            flags: range
            values: 0 100
            value: 0
    36 bottom margin:
            flags: range
            values: 0 100
            value: 0

dmesg | tail -n60
[ 15.823630] Bluetooth: HCI UART protocol H4 registered
[ 15.823708] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 15.824033] Bluetooth: HCI UART protocol Broadcom registered
[ 15.992540] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 15.992546] Bluetooth: BNEP filters: protocol multicast
[ 15.992559] Bluetooth: BNEP socket layer initialized
[ 1089.294406] irq 32: nobody cared (try booting with the "irqpoll" option)
[ 1089.294414] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 5.4.49-v7l+ #1323
[ 1089.294417] Hardware name: BCM2711
[ 1089.294421] Backtrace:
[ 1089.294436] [] (dump_backtrace) from [] (show_stack+0x20/0x24)
[ 1089.294441] r6:c1200000 r5:00000000 r4:c129c6b8 r3:3dd3f420
[ 1089.294450] [] (show_stack) from [] (dump_stack+0xe0/0x124)
[ 1089.294458] [] (dump_stack) from [] (__report_bad_irq+0x38/0xd0)
[ 1089.294463] r8:da848800 r7:00000020 r6:da97b300 r5:00000000 r4:da97b300 r3:3dd3f420
[ 1089.294470] [] (__report_bad_irq) from [] (note_interrupt+0x280/0x2d0)
[ 1089.294475] r6:da97b300 r5:00000000 r4:da97b300 r3:0001863c
[ 1089.294481] [] (note_interrupt) from [] (handle_irq_event_percpu+0x6c/0x8c)
[ 1089.294486] r10:0000016a r9:c1200000 r8:da848800 r7:00000001 r6:da97b300 r5:00000000
[ 1089.294490] r4:c1204f88 r3:00000000
[ 1089.294496] [] (handle_irq_event_percpu) from [] (handle_irq_event+0x54/0x78)
[ 1089.294500] r6:c1201ed0 r5:da97b368 r4:da97b300
[ 1089.294506] [] (handle_irq_event) from [] (handle_fasteoi_irq+0xb4/0x194)
[ 1089.294511] r6:c1201ed0 r5:c1205a14 r4:da97b300 r3:000186a0
[ 1089.294517] [] (handle_fasteoi_irq) from [] (generic_handle_irq+0x34/0x44)
[ 1089.294521] r5:00000000 r4:c10a82e4
[ 1089.294526] [] (generic_handle_irq) from [] (__handle_domain_irq+0x6c/0xc4)
[ 1089.294533] [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0x88)
[ 1089.294538] r8:f0815000 r7:f0814000 r6:c1201db0 r5:f081400c r4:c1205a14 r3:c1201db0
[ 1089.294543] [] (gic_handle_irq) from [] (__irq_svc+0x5c/0x7c)
[ 1089.294547] Exception stack(0xc1201db0 to 0xc1201df8)
[ 1089.294551] 1da0: c02023f8 00000000 60000193 c10a8300
[ 1089.294556] 1dc0: 00200002 00000000 00000000 00000001 da848800 00000282 0000016a c1201e6c
[ 1089.294561] 1de0: c12053ac c1201e00 00000000 c02023fc 60000113 ffffffff
[ 1089.294566] r8:da848800 r7:c1201de4 r6:ffffffff r5:60000113 r4:c02023fc r3:3dd3f420
[ 1089.294574] [] (__do_softirq) from [] (irq_exit+0x100/0x110)
[ 1089.294578] r10:0000016a r9:c1200000 r8:da848800 r7:00000001 r6:00000000 r5:00000000
[ 1089.294582] r4:c10a82e4
[ 1089.294588] [] (irq_exit) from [] (__handle_domain_irq+0x70/0xc4)
[ 1089.294593] [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0x88)
[ 1089.294598] r8:f0815000 r7:f0814000 r6:c1201ed0 r5:f081400c r4:c1205a14 r3:c1201ed0
[ 1089.294603] [] (gic_handle_irq) from [] (__irq_svc+0x5c/0x7c)
[ 1089.294607] Exception stack(0xc1201ed0 to 0xc1201f18)
[ 1089.294611] 1ec0: c0209b94 00000000 60000093 c021c160
[ 1089.294616] 1ee0: c1204fb4 c1200000 c1204ffc 00000001 c12a30ad c106ca48 0000016a c1201f2c
[ 1089.294620] 1f00: c12053ac c1201f20 00000000 c0209b98 60000013 ffffffff
[ 1089.294625] r8:c12a30ad r7:c1201f04 r6:ffffffff r5:60000013 r4:c0209b98 r3:3dd3f420
[ 1089.294633] [] (arch_cpu_idle) from [] (default_idle_call+0x34/0x48)
[ 1089.294640] [] (default_idle_call) from [] (do_idle+0xec/0x170)
[ 1089.294645] [] (do_idle) from [] (cpu_startup_entry+0x28/0x2c)
[ 1089.294649] r8:ffffffff r7:c12b5440 r6:c106ca48 r5:c12b5498 r4:000000ce r3:c1201f48
[ 1089.294655] [] (cpu_startup_entry) from [] (rest_init+0xbc/0xc0)
[ 1089.294662] [] (rest_init) from [] (arch_call_rest_init+0x18/0x1c)
[ 1089.294666] r4:c1204f88 r3:c109d270
[ 1089.294672] [] (arch_call_rest_init) from [] (start_kernel+0x4e4/0x518)
[ 1089.294678] [] (start_kernel) from [<00000000>] (0x0)
[ 1089.294681] handlers:
[ 1089.294720] [<5b038e4c>] vc4_hvs_irq_handler [vc4]
[ 1089.294724] Disabling IRQ #32
[ 1099.379128] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] ERROR [CRTC:72:crtc-3] flip_done timed out

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