Verified libgl1-mesa-dri_21.3.0~rc5-1_amd64.deb from Debian, it works.
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https://bugs.launchpad.net/bugs/1944951
Title:
KDE delayed display update / konsole artifacts
To manage
Package libgl1-mesa-dri, file iris_dri.so
** Package changed: kwin (Ubuntu) => mesa (Ubuntu)
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https://bugs.launchpad.net/bugs/1944951
Title:
KDE delayed display update / konsole
[1] says that the issue will be fixed in Mesa 21.3.0.
[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=994057#44
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Title:
KDE delayed
Thanks to the tests done by Michael it was easy to figure out the file in
question.
It's the file iris_dri.so from package libgl1-mesa-dri.
Taken it from 21.0.3 and it worked.
Don't know if it's safer just to replace this file or all Mesa libraries.
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I'm having this issue on Debian testing as well, after an upgrade of Mesa
packages from 20.3.5-1 to 21.2.4-1.
The problem disappears after downgrading to version 20.3.5-1 of the packages
and rebooting (packages in my case: libegl-mesa0 libegl1-mesa-dev
libgl1-mesa-dev libgl1-mesa-dri
Tried a few more things:
Booted from the Kubuntu 21.10 live beta DVD, problem persists.
Booted from KDE Neon DVD, no artefacts.
Turned on composite management, started a new konsole. Turned off composite
management.
Konsole display is without errors. So I can have one konsole with problems and
Maybe this helps:
I'm using a somewhat newer version of the Intel VGA:
00:02.0 VGA compatible controller: Intel Corporation CometLake-S GT2 [UHD
Graphics 630] (rev 03)
and I do not have an additional Nvidia card.
Switching from modesetting_drv.so to intel_drv.so also causes the
problem is
** Summary changed:
- delayed display update / konsole artifacts
+ KDE delayed display update / konsole artifacts
** Package changed: xorg (Ubuntu) => kwin (Ubuntu)
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