[Pkg-raspi-maintainers] Bug#977642: 5.10 kernel needs disable_fw_kms_setup=1

[Ryutaroh Matsumoto]

Package: raspi-firmware
Version: 1.20201022-1
Severity: normal
X-Debbugs-CC: lucas at debian.org

Dear Debian raspi-firmware maintainers,

Linux 5.10 kernel's vc4.ko starts partial support of RPi 2/3/4 VideoCore 4 GPU,
and it enables 4K HDMI output, which is very welcome.

But in some situation, screen output is garbled as reported at
http://lists.infradead.org/pipermail/linux-rpi-kernel/2020-November/007894.html

The above symptom can be fixed by adding disable_fw_kms_setup=1 as
reported at
http://lists.infradead.org/pipermail/linux-rpi-kernel/2020-November/007900.html

I do not think this is a bug in raspi-firmware, but config.txt is handled by
raspi-firmware, please consider to add disable_fw_kms_setup=1.

Best regards, Ryutaroh Matsumoto