rv200 video corruption caused by what? kernel? Xserver? DDX? Mesa?

[Felix Miata]

Felix Miata composed on 2020-03-25 19:30 (UTC-0400):

> Alex Deucher composed on 2020-03-25 13:22 (UTC-0400):

>> Felix Miata wrote:

>>> 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV200 [Radeon 7500/7500 LE] [1002:5157]

>>> Debian Buster and Mageia 7 are OK, but with Fedora 30 and Tumbleweed with
>>> kernels newer than 5.3.x, solid background and mouse pointer are all that
>>> paint properly: http://fm.no-ip.com/SS/rv200corrupt.png

>>> Is this a known problem? If not, whose bug tracker do I file this on, and
>>> which component?

>> Can you bisect?  The relevant radeon code in all of these components
>> hasn't really been touched in ages.  Maybe related to this:
>> https://lkml.org/lkml/2019/12/14/263
>> but that was kernel 5.4 not 5.3.

> I spent a bunch of time looking for in between kernels to try. In the process I
> tried also with RV250 and RV380 without being able to repro. Eventually I stumbled
> onto radeon.agpmode=-1, which worked around the corruption well enough on Fedora
> and Tumbleweed.

> I got luckier and found after reading your lkml URL
> https://bugs.mageia.org/show_bug.cgi?id=26237
> reported against kernel-desktop-5.5.4-1.mga7-1-1.mga7 to produce corrupt Xorg
> video described much like observed here. That bug reports fixed with
> kernel-desktop-5.5.6-1.mga7. I found and installed 5.5.4 and confirm it's broken,
> and that it's fixed in 5.5.6-2.mga7, which explains why I failed to experience
> this in Mageia, where I had jumped from 5.3.13 to 5.4.17.

> Apparently whatever Mageia did should be upstreamed if it hasn't been lately.
> Fedora's 5.5.10 remains bad.

>From Mageia kernel-desktop changelogs:
update to 5.5.6 20200312:
- work around radeon regression introduced in 5.4 series (mga#26237)
  * Revert "drm/radeon: simplify and cleanup setting the dma mask"
  * Revert "drm/radeon: handle PCIe root ports with addressing limitations"
update to 5.4.6 20200215:
- Revert "drm/radeon: simplify and cleanup setting the dma mask"
- Revert "drm/radeon: handle PCIe root ports with addressing limitations"
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Felix Miata  ***  http://fm.no-ip.com/