Comment 22 for bug 1789071

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While I can't exactly see the problem, I can parse those files you
attached. I find something interesting:

Aug 27 17:17:19 lubuntu kernel: [ 41.607050] radeon 0000:01:00.0:
texture bo too small ((1024 768) (64 1) 1 26 0 -> 3145728 have 4096)
Aug 27 17:17:19 lubuntu kernel: [ 41.607057] radeon 0000:01:00.0:
alignments 1024 64 1 256
Aug 27 17:17:19 lubuntu kernel: [ 41.607136] [drm:radeon_cs_ioctl
[radeon]] *ERROR* Invalid command stream !

This occurs shortly after sddm loads. There'a a bug that results in some
updates to the radeon driver that mentions sddm:
https://bugs.freedesktop.org/show_bug.cgi?id=105381

I can only presume this is some sort of interaction between sddm and
that bug. That said, I would encourage you to check out Kubuntu and see
if you have problems with it. My guess is that you do.

Meanwhile, that fix is coming soon, but hasn't landed yet. Looking at
the Debian changelog "glamor: Use GBM for BO allocation when possible"
is found in version 1:18.0.1-2 while we are on 1:18.0.1-1build1.

In any case, we can be certain that the issue is not Lubuntu artwork!

 status invalid
 affects ubuntu/xserver-xorg-video-ati
 status fixcommitted
 summary "Invalid command stream with Radeon driver"
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