1749376 - (wr-refresh-rate) [meta] [project] Fix WebRender issues with high refresh rate

Status: NEW

(Core :: Graphics: WebRender, defect)

Comment 1

[Dzmitry Malyshau [:kvark]]

Marking for gfx-triage for awareness on the next call

Comment 2

[Ashley Hale [:ahale]]

For anyone curious what this meta bug is really about, there are a few kinds of bug tracked here:

• Jank with a video playing on high refresh rate displays
  • The video itself suffers jank when playing a video at 60fps on a 144hz display for example, where we're missing vsync targets repeatedly, hitting pending frame limits in the video decode, and sporadically taking >100ms to draw a frame, spinning on a lock.
  • Autoscrolling while playing a 4K60 video frequently has jank on YouTube, which is probably the same issue.
• Compositor artifacting
  • Circumstances seem to involve a WebRTC video call (in a completely separate app, not the browser), which triggers compositor VirtualSurface binding issues where it shows the wrong image on some of the tiles on some refreshes in DWM, this is easily capturable on video - see demonstration here: https://bugzilla.mozilla.org/show_bug.cgi?id=1638709#c172
  • Issues with the workaround of disabling dcomp on Windows 10 - https://bugzilla.mozilla.org/show_bug.cgi?id=1828683

Comment 3

[Ashley Hale [:ahale]]

Regarding the compositor artifacting, those bugs appear to be fixed by https://support.microsoft.com/en-us/topic/may-29-2024-kb5037853-os-builds-22621-3672-and-22631-3672-preview-dcf14fd8-84d6-4234-9d5b-784c319cd7cf (Windows 11 22H2 or later) and https://support.microsoft.com/en-us/topic/june-25-2024-kb5039299-os-build-19045-4598-preview-d4e3e815-fdd8-465e-8144-42afa165efed (Windows 10 22H2, which is the final version), we'll need to confirm with the reporters of the individual bugs.