Bug#1027142: Correction: Not a permissions but a settings problem
In searching for the cause, I found that
the failure of 2D acceleration must be due to a user configuration
problem rather than a permissions problem.
The system partition and thus the roots
folder were newly created, the /home/ partition was taken over
from the previous installation. This was created years ago with
Debian 9 (at that time with a radeon driver).
The 2D acceleration does not work for any
of the old users. But it does for a completely new user or the
new root-account created during the installation.
So there must be a problem with the old
user settings that prevents access to the hardware acceleration
memory or puts it on a wrong address.
No idea which one this should be and where
to find it.
My solution now is to recreate the user
directories and move the data from the old directories there.
Users will then have to redo their settings, which is less tragic
than not having 2D acceleration.
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