Bug#1040346: linux-image-6.3.0-2-amd64: AMDGPU only with unusable high resolution available
Hi Klaus,
On Wed, Jul 05, 2023 at 02:17:34PM +0100, Klaus Ethgen wrote:
> Hi,
>
> Am Mi den 5. Jul 2023 um 12:59 schrieb Bastian Blank:
> > On Wed, Jul 05, 2023 at 11:31:06AM +0100, Klaus Ethgen wrote:
> > > > But this is what you want, you want to use the full resolution of the
> > > > output and scale the output (this is called HiDPI). If you try to
> > > > change the resolution to a non-native one, everything gets mushy.
> > > No, I don't want the full resolution. It is unreadable. I usually use
> > > 1920x1200 which is exactly 1/4 of the resolution so nothing gets mushy.
> >
> > So you use full resolution and 200% scaling.
>
> If you see it that way, yes. Just on X level.
>
> > Anyway, I can't reproduce this using amdgpu on:
> >
> > | % uname -a
> > | Linux steamhammer 6.3.0-2-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.3.11-1 (2023-07-01) x86_64 GNU/Linux
> >
> > | % lspci -nn | grep VGA
> > | 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev c1)
>
> I see that bug on two systems (both lenovo) but with Rembrandt GPU.
>
> > | % cat /sys/class/drm/card0-DP-1/modes | head -n 10
>
> Well, the display is the eDP, currently I have no other display
> connected.
>
> On the buggy kernel, I have only the native resolution in that sys file
> and in the kernel before I see 12 entries.
Can you check if it is the following known regression:
https://lore.kernel.org/stable/MN0PR12MB6101C52C4B7FB00702A996EBE224A@MN0PR12MB6101.namprd12.prod.outlook.com/
Regards,
Salvatore
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