I went back further in the history of i915 changes and found the
offending commit:
https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/groovy/commit/?id=c1484c9939
If you revert c1484c9939 then the bug goes away.
** Summary changed:
- [i915] Noise-like lines of graphics
I think I might have got some incorrect results in comment #39. Because
the bug still occurs when I build from git all the way back to
Ubuntu-5.8.0-13.14. Also reverting the four commits in comment #42 does
not fix it. The only thing that solves the bug is going to a mainline
kernel/branch/tag.
Two days later... my bisection has failed. Also probably related -- in
git the tag Ubuntu-5.8.0-18.19 has the bug, but not in the binary
release. Perhaps I need to be more careful with the configs used instead
of defaulting. Or maybe I will just start hacking around the
aforementioned commits.
--
Yea, so only two commits need to be tested.
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https://bugs.launchpad.net/bugs/1896091
Title:
[i915] Noise-like lines of graphics corruption when moving windows in
Xorg sessions
Can I assume "tgl+" means it's code I don't use on Kaby Lake?
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https://bugs.launchpad.net/bugs/1896091
Title:
[i915] Noise-like lines of graphics corruption when moving windows in
Four commits to test:
$ git log --pretty=oneline Ubuntu-5.8.0-18.19..Ubuntu-5.8.0-19.20
drivers/gpu/drm/i915
ae8bb7c11c7e5379394557469a777885e0644ce4 drm/i915/tgl+: Fix TBT DPLL fractional
divider for 38.4MHz ref clock
6337b734a9d7ab1467538229716755b5ba40f8fa drm/i915/tgl+: Use the correct
Enabling PSR does not fix it. The bug remains.
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https://bugs.launchpad.net/bugs/1896091
Title:
[i915] Noise-like lines of graphics corruption when moving windows in
Xorg sessions
