jiayuanwen / pi4-raspberrypios-tv-desktop-no-signal-fix Goto Github PK

• Sony Bravia KDL-42EX440 LCD TV
• Raspberry Pi 4 Model B (2GB)
  • OS: Raspberry Pi OS (Raspbian) 11 bullseye

When connecting Pi 4 to TV via Micro-HDMI to HDMI, the boot-loader and initial splash shows up. As soon as the desktop loads, the TV shows no signal.

Raspberry Pi OS (Raspbian) 11 uses KMS driver by default, which is not compatable with this TV model. We need to switch to FKMS drivers.

1. Find a way to access your system file in Pi (either via SSH, use secondary PC monitor, or plug your Pi's SDcard to a working PC and access the partition where /boot is located)
2. Edit config.txt in your /boot system folder as a super user. Ex: $ sudo nano /boot/config.txt
3. Find the line dtoverlay=vc4-kms-v3d, change it to dtoverlay=vc4-fkms-v3d. Uncomment if it is commented out, add if line doesn't exist.
4. Connect your Pi's HDMI to TV, turn both on.