Comment # 16 on bug 1178474 from Mark Draheim

(In reply to Patrik Jakobsson from comment #15)

> Can you try setting i915.enable_dc=0 and i915.enable_psr=0. Try them one at
> a time so we know which one (if any) helps.

for me, neither has any positive effect. Disabling dc made video playback
stuttering a tiny tad less annoying but it came with visual artefacts like old
window decorations blinking in. Disabling psr got me a hard lockup 30 seconds
into the session.

On a general note, I had screen lockups occasionally with kernels before 5.9 on
this laptop i7-10th but not on an old Skylake laptop with integrated intel
graphics. But the video stuttering definitely started with kernel 5.9. It shows
in video playback freeze framing every few seconds. On the desktop I have
window-fade-on-close which quite often yields the window stopping at half
transparent and then closing as in the fading started, then screen does not
update, then window is gone. It is probably the same with the typing keys lag,
ie screen is simply not updating for a second, then the chars I typed appear at
once.