Still no luck, there are again freezes with associated errors of i915:
Mai 02 22:55:04 Kiwi kernel: i915 0000:00:02.0: [drm] *ERROR* GT0: rcs0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
Mai 02 22:55:19 Kiwi kernel: BUG: kernel NULL pointer dereference, address: 0000000000000278
Mai 02 22:55:19 Kiwi kernel: #PF: supervisor read access in kernel mode
Mai 02 22:55:19 Kiwi kernel: #PF: error_code(0x0000) - not-present page
-- Boot 0ca0e5bf26a749dfb3c1646cf50c910a --
By now I have:
- switched back to Wayland instead of Xorg (supposedly more "graceful" error-handling)
- i915.enable_psr=0 (disable PSR, power save mode, as suggested by @sammolaw)
- deactivated hardware acceleration for Brave
After some suggestions by ChatGPT4/turbo I also tried disable power save mode rc6 of GPU (i915.enable_rc6=0), but this does not seem to work because apparently this is not configurable in the current kernel 6.8.0-58-generic.
If I remember correctly the freezes started with some of the updates approximately two weeks ago. There was a kernel update at the time, is it possible that this is related? Should I try a downgrade to the older version of the kernel?