Closed Bug 1464679 Opened 2 years ago Closed 2 years ago
Only use _NET
_WM _BYPASS _COMPOSITOR hint with Basic compositor
47 bytes, text/x-phabricator-request
|Details | Review|
I see from bug 1134077 that the _NET_WM_BYPASS_COMPOSITOR hint was added to Firefox windows to resolve video tearing; however, on versions of Firefox prior to 60, I didn't have any issues with fullscreen videos (I am admittedly voiding my warranty with media.hardware-video-decoding.force-enabled, which on my hardware is the only way I've found to get decent video performance at all). Since upgrading to 60, however, fullscreen videos have more latency and the video lags behind the audio, and I only just figured out that this change was to blame—when I remove that hint, video goes back to its pre-60 performance. Can you please make this hint controllable with an about:config preference? I'm fine with the hint being present by default, since it seems like you have a logical justification for setting it, but at least for me (and I would assume some other power users as well), having the ability to disable it is necessary to make videos watchable on Firefox.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
What is "Compositing" in about:support? If it is not "Basic", then framebuffer updates probably are aligned with vblank, in which case _NET_WM_BYPASS_COMPOSITOR should not be set. It would be better to do this automatically than to require an additional preference to be set.
I have OpenGL for Compositing, so that sounds like a good idea to me!
Attachment #9028375 - Attachment description: Bug 1464679 - X11: Add preference to control _NET_WM_BYPASS_COMPOSITOR hint. r?karlt → Bug 1464679 - X11: Only use _NET_WM_BYPASS_COMPOSITOR hint with Basic compositor. r?karlt
Summary: Control _NET_WM_BYPASS_COMPOSITOR hint with preference → Only use _NET_WM_BYPASS_COMPOSITOR hint with Basic compositor
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/a0315e4606c7 X11: Only use _NET_WM_BYPASS_COMPOSITOR hint with Basic compositor. r=karlt
Assignee: nobody → ryan.hendrickson
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