On Arch Linux, drm-intel Iris Graphics 540, X11, HiDPI screen, Firefox Nightly using WebRender. Playing a fullscreen video in Firefox (youtube or netflix), every minute or so, the image freezes but audio keeps playing. Pressing a key, like ctrl, is enough to resume playback as if nothing happened (audio & video in sync) and then if does it over and over again, sometimes pressing a key is not necessary. Disabling WebRender fixes the problem, other video players don't have the issue.

I take a look.

FYI, It doesn't seem to happen all the time, I played videos yesterday and it was just fine... But it has happened many times to me over the course of the past two months. Also, I've been playing with intel drm-tip kernel driver and PSR features, so maybe it's driver-related but I'm quite confident it only happens to firefox with webrender. Also, I'm going to be on holiday for the next two weeks, so if I don't reply don't think I've lost interest...

When I tested locally several times on linux, I could not reproduce the problem.

P3 because seemingly linux-only (not a focus for the first wr stages)

I could not reproduce the bug.

Hello. I cannot reproduce this issue either. It probably was an issue either with webrender, mesa or the driver, or a combination, but I haven't had video playback issues in a while.