garbled screen with RPI4 on 5.10-rc2

[Maxime Ripard]

On Tue, Nov 03, 2020 at 09:35:43PM +0100, Lucas Nussbaum wrote:
> On 03/11/20 at 16:27 +0100, Maxime Ripard wrote:
> > On Tue, Nov 03, 2020 at 03:33:03PM +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.
> > 
> > That's just for the initial framebuffer, X is then free to ignore that
> > to change it if it feels like it (and it looks like it does from the logs)
> 
> Strange, since disable_fw_kms_setup=1 really fixes it (I checked again).
> 
> If you think it's worth debugging and I can help somehow, let me know!

Do you have any other display you could test with?

I just tested with my 4k display, forcing the firmware to setup a 1080p
resolution so I end up with a system pretty similar to yours, but the
issue is not there.

That was with my kernel, in arm32 though, I'll test with the debian one
you pointed at.

Maxime
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