If llvmpipe is working, that's just because it avoids using the GPU.
It's a slow workaround.
If going back to Mesa version 21.3.5-1ubuntu1 from Ubuntu reintroduces
freezes then I suggest that needs to be debugged by KDE/Plasma
developers.
** Also affects: kwin (Ubuntu)
Importance: Undecided
Status: New
** Also affects: meta-kde (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mesa (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1960403
Title:
Kubuntu constantly freezing on ThinkPad T510
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