r300: Regression in f424ef18010 breaks wayland on RS480M

[Marek Olšák]

Hi,

Can you please file a gitlab issue and post a screenshot of the corruption?

Thanks,
Marek

On Tue, Oct 8, 2024, 15:21 Valtteri Koskivuori <vkoskiv at gmail.com> wrote:

> Hello all.
>
> I run Arch Linux on a 2006 Fujitsu S2110 laptop that has sentimental
> value to me. Earlier in 2024, I observed a regression that broke
> wayland-based compositors, such as Sway and Cage. The framebuffer shows
> up garbled, and the following error is emitted to the kernel log:
>
> [drm:radeon_crtc_do_set_base [radeon]] *ERROR* trying to scanout
> microtiled buffer
>
> I spent the past weekend tracking this down, and managed to set up for a
> bisect, which lead me to that specific commit, which was a part of merge
> request !28209 in March.
> Mesa seems to be setting the tiling flag RADEON_TILING_MICRO, which then
> later gets checked in the Linux driver, giving that error above.
>
> TL;DR: reverting f424ef18010 on the latest HEAD resolves this issue for
> me,
> though I'm not familiar enough with the code to determine if reverting
> it results in adverse effects on other hardware. More details below for
> the interested.
>
> GPU: [AMD/ATI] RS480M [Mobility Radeon Xpress 200]
> CPU: AMD Turion(tm) 64 Mobile Technology MT-37
> Linux arch 6.11.1-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 30 Sep 2024 23:49:50
> +0000 x86_64 GNU/Linux
> Mesa 24.2.3-1 (arch package)
> Sway and Cage were broken, but i3 seems to be unaffected.
>
> I hope this information is helpful. I'd be happy to help with testing a
> potential fix, if needed.
>
> Thank you all for the work you do.
> Br,
> Valtteri Koskivuori
>
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