Hello,
I have recently installed Fedora 42 ARM on my Raspberry Pi 4 Model B by following this guide.
I also have a Raspberry 7-inch touchscreen display connected by ribbon cable on the MIPI DSI port.
The display turns on and shows the boot process as normal, but when the system is done booting, the whole display fades slowly to white then back to black.
I can connect a larger monitor to the HDMI port and see that the system has successfully booted and is usable as normal. It is only the 7-inch display that is not working. My suspicion is that it has something to do with the driver for the display port. Doing some googling prior to this I’ve found the /boot/efi/config.txt that rpi reads on boot. It seems that the setting I need is dtoverlay=vc4-kms-dsi-7inch, but I cannot seem to fix the fade to white problem no matter which combination of settings I try.
Here’s a youtube video of the full boot and what the “fade to white” looks like.
And here’s my current /boot/efi/config.txt:
# Options you can adjust for all Raspberry Pi Revisions
# https://www.raspberrypi.com/documentation/computers/config_txt.html
# Some settings may impact device functionality. See link above for details
# To use this on Fedora you need to use firmware provided device tree, not kernel
# For this functionality follow the following guide:
# https://fedoraproject.org/w/index.php?title=Architectures/ARM/Raspberry_Pi/HATs
# Details on overlays and additional parameters are documented in
# /boot/efi/overlays/README
# Default Fedora configs for all Raspberry Pi Revisions
# Put the RPi into 64 bit mode
arm_64bit=1
# We use U-Boot
kernel=rpi-u-boot.bin
# Run as fast as the firmware allows
arm_boost=1
# Enable UART
# Only enable UART if you're going to use it as it has speed implications
# Serial console is ttyS0 on RPi3 and ttyAMA0 on all other variants
# u-boot will auto detect serial and pass corrent options to kernel if enabled
# Speed details: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=141195
enable_uart=1
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Old FW camera
camera_auto_detect=0
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-ili9881-7inch
dtoverlay=vc4-kms-dsi-7inch
max_framebuffers=2
ignore_lcd=0
# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1
# Stop the RPi turning on HDMI monitors on reboot
hdmi_ignore_cec_init=1
# Raspberry Pi 3 series
[pi3]
dtoverlay=upstream
# Zero series
[pi0]
gpu_mem=16
# Raspberry Pi 4 series
[pi4]
dtoverlay=upstream-pi4
# Allow 256Mb of CMA by default on RPi4+
dtoverlay=cma,cma-256
# 4K display support - RPi4+ only, only one port possible
# hdmi_enable_4kp60=1
# Raspberry Pi CM4
[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
# Raspberry Pi 5
[pi5]
# Allow 256Mb of CMA by default on RPi4+
dtoverlay=cma,cma-256
# 4K display support - RPi4+ only, only one port possible
hdmi_enable_4kp60=1
[all]
# HAT and DT overlays. Documentation at Raspberry Pi here:
# https://www.raspberrypi.org/documentation/configuration/device-tree.md
# Each dtoverlay line is an individual HAT/overlay, multiple lines allowed
# dtoverlay=rpi-sense
dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# For cameras enable the sensor, examples below, support is still very early
# EG RPi Camera Module 2
dtparam=imx219