Debian-Pi-Aarch64/hardware/kms_fkms/full_kms_testing.md

Full KMS Support

Require Kernel Version >= 5.10.79-Release-OPENFANS+20211117-v8

1.Edit Config.txt, change all "dtoverlay=vc4-fkms-v3d,cma-256" to "dtoverlay=vc4-kms-v3d,cma-256" ;

2.Add "disable_fw_kms_setup=1" to Config.txt

---

Note:

The log of dmesg:

...
vc4_hdmi fef00700.hdmi: Could not register sound card: -517
...
hdmi-audio-codec hdmi-audio-codec.8.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
...

These "errors" are expected and can be ignored.