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

[Felix Miata]

Felix Miata composed on 2020-03-25 20:59 (UTC-0400):

> 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" 

I reported a bug: https://bugzilla.kernel.org/show_bug.cgi?id=206973
[AMD/ATI] RV200 [Radeon 7500/7500 LE] [1002:5157] overwhelming video
corruption in Xorg
-- 
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Felix Miata  ***  http://fm.no-ip.com/