[Pkg-raspi-maintainers] Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement

[James Addison]

Followup-For: Bug #1035878
Control: reassign -1 linux-image-6.1.0-8-arm64

The RPi team suggested that this is likely to be a Linux kernel issue, and I've
tested an updated v6.1.21 kernel build of theirs (including the likely fix[1])
that does resolve the problem.

[1] - https://github.com/raspberrypi/linux/commit/013f247b89b6fa55724cb73a820cadcae745d1ee