RPi4B goes to black screen with vc4-kms-v3d after commit#1e494f1

[yullaw]

Decription of issue: RPi4B goes to the black screen of TV LG 42LK450-ZB (2012). The booting process with 4 raspberries is visible, after that the black screen only. The TV doesn't complain about "No signal", the GUI sound can be hear (test with LibreELEC 10.0.1). With RPiOS Lite doesn't appear the CLI with login.

How to reproduce:

• fresh install 2021-05-07-raspios-buster-armhf-lite.zip
• CLI with login reached
• sudo apt update
• sudo apt full-upgrade
• sudo rpi-update
• reboot
• CLI and login reached
• card removed and config.txt modified from dtoverlay=vc4-fkms-v3d to dtoverlay=vc4-kms-v3d
• card inserted back, booting with 4 raspberries appeared, then it goes to black screen
• on TV selected HDMI1 and then HDMI3 back where the RPi4B is connected to -> CLI and login reached

Up to the commit#beeeb4f working fine and CLI/GUI reached. After the commit#1e494f1 the CLI/GUI is not reached.

• sudo rpi-update 1e494f150046bd04331ab0b19e4e5322eb7b7773
• reboot
• no login in CLI
• on the TV select different HDMI port and go back to original HDMI

For more details please see the discussion with all logs and results:

• https://forum.libreelec.tv/thread/24780-le-10-0-1-rpi4-no-picture-after-update-from-le-10-0-0/?postID=162536#post162536

Many thanks

[ajay01994]

Hi guys As mentioned by @Rohlik dtoverlay=vc4-fkms-v3d. did work for my raspberry pi 4b while fixing the blue screen issue ,however my HDMI CEC isn't working post changing to (fkms). Any help over this would be appreciated

[ajay01994]

Has the issue fixed / resolved ?

[circuitmike]

Definitely hasn't been resolved. I just did a brand-new install of Raspberry Pi OS (lite version) on a Pi 4 and I had to comment out dtoverlay=vc4-kms-v3d entirely. Switching to fkms did cause the monitor to get a signal (so it switched to "awake" mode, as indicated by the color of the LED on its front panel) but the display was still blank.