Upgrade from 1.20250305 to 1.20250326, display no longer works

Start with the reported /boot/firmware/config.txt, uname -a output, and vcgencmd version output, then compare display behavior between firmware 1.20250305, 1.20250326, and the working 6.6.xx version. Done means isolating the upgrade-related display regression or documenting a confirmed configuration or firmware resolution for the RPI DIS10180P/Elecrow RC101S display.

Firmware upgrade caused the touchscreen display to stop working. No image, just scrambled lines.
Tried to manually downgrade the firmware, went back too far to version 6.6.xx, display worked but there were other unrelated issues.

It has been confirmed that the display works, Raspi 5 works, ports (USB,HDMI) works.

pi@LucyPi5:~ $ uname -a
Linux LucyPi5 6.12.22-v8-16k+ #1871 SMP PREEMPT Mon Apr  7 13:45:56 BST 2025 aarch64 GNU/Linux

pi@LucyPi5:~ $ vcgencmd version
2025/04/08 00:16:47
Copyright (c) 2012 Broadcom
version 50beecf0 (release) (embedded)

There was a bug fix for a another type of display, that why the firmware was updated to 6.12.22. It didn't help my case.

/boot/firmware/config.txt

# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Additional overlays and parameters are documented
# /boot/firmware/overlays/README

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
#display_auto_detect=1

# Automatically load initramfs files, if found
auto_initramfs=1

# Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2

# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

# Run as fast as firmware / board allows
arm_boost=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

![Image](https://github.com/user-attachments/assets/3f8ce10f-72ea-4255-8b3c-cf87340882bc)

![Image](https://github.com/user-attachments/assets/c157566e-a79f-41f5-90ee-01067b7ec9ae)

[cm5]
dtoverlay=dwc2,dr_mode=host

[all]

dtoverlay=vc4-fkms-v3d
max_framebuffers=2

lcd_rotate=2
start_x=1
gpu_mem=256

hdmi_blanking=1

hdmi_group=2
hdmi_mode=87
hdmi_cvt=1024 600 60 0 0 0
display_hdmi_rotate=3

hdmi_force_hotplug=1

hdmi_driver=2
#usb_max_current_enable=1

#device_tree_address=0x03000000
#enable_tvout=0

Display:
RPI DIS10180P
Elecrow RC101S 10 1024x600 IPS