Hello,

> Testing with versions in between from snapshot.debian.org reveals that
> it's still OK with 21.1.6-1 and the issue starts with 21.2.0-1.
>
> Other related reports that look like they might be about the same
> problem, all related to Mesa 21.2 (I'm seeing artifacts in Firefox and
> in Konsole as described, as well as in other applications):
>
> https://forum.manjaro.org/t/konsole-tmux-rendering-problems-horizontal-stripes/86975
> https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1944951

I observe the same problem, although only with similar but not identical
hardware

> Graphics card info from 'hwinfo' output:
>
>      49: PCI 02.0: 0300 VGA compatible controller (VGA)
>        Device Name: "Onboard IGD"
>        Model: "Intel UHD Graphics 630 (Mobile)"
>        Vendor: pci 0x8086 "Intel Corporation"
>        Device: pci 0x3e9b "UHD Graphics 630 (Mobile)"
>        Driver: "i915"
>        Driver Modules: "i915"

Here is my (shortened) 'hwinfo' output:

24: PCI 02.0: 0300 VGA compatible controller (VGA)
  Device Name: "Onboard IGD"
  Model: "Intel HD Graphics 530"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x1912 "HD Graphics 530"
  Driver: "i915"
  Driver Modules: "i915"

I tested the Mesa upstream version from https://gitlab.freedesktop.org/mesa/
mesa/-/tree/main and can confirm the broken version there, too.

However: I didn't get any artifacts with mesa-21.3.0-rc4. I didn't bisect that
as mesa-21.2.5 has the artifacts and it does not matter which rc fixes it.

So we probably need our pinning in /etc/apt/preferences
> Package: libegl-mesa0 libgbm1 libgl1-mesa-dri libglapi-mesa libglx-mesa0
> Pin: version 21.2.*
> Pin-Priority: -1
for some more days until 21.3.0 is released and if that gets packaged quickly,
the problem should probably be gone soon.

Kind regards
Patrick

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