garbled screen with RPI4 on 5.10-rc2

Lucas Nussbaum lucas at
Tue Nov 3 11:24:32 EST 2020

On 03/11/20 at 15:33 +0100, Stefan Schake wrote:
> Your kernel command line from the initial post seems to already have a
> video=HDMI-A-1:1920x1080M at 60
> setting, and this will override any HDMI detection.

Ah, right!

to config.txt fixes this (this is documented in


Now I'm confused: with the state of 5.10-rc2, should I get hardware
acceleration in X? Mesa still uses llvmpipe here. (but maybe something
else is too old in Debian 10)

- Lucas

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