Bug#998386: mesa 21.2.4-1 makes graphical desktop (plasma) unusable

[Chris Nospam <chris21k@gmx.de>]

Package: mesa
Version: 20.3.5-1
Severity: critical
Justification: breaks graphical system like KDE

After updateing mesa from 20.3.5 to 21.2.4 in bookworm (migrated on October 21th to testing) my graphical KDE plasma 5.21 under x11 renders unusable. Note plasma 5.23 is currently unusable in testing, see, e.g., bug #996670. There are many more or less longer horizontal lines flying around, and changes of content, like typing text within a terminal, makes just written characters unreadable. The system is very slow to redraw the characters afterwards. Highlighting of elements like menus is slow and ugly. My System is a Core i7-6700 system with integrated CPU grahics Intel HD Graphics 530 rev 06.
The login manager sddm works with both versions as desired, as (I believe) it does not use mesa.

Hotfix: dowgrade all installed mesa packages to 21.2.4

Thanks fpr looking into it,
Chris