Comment # 33
on bug 99418
from lei.pero@gmail.com
(In reply to Michel Dänzer from comment #32) > (In reply to lei.pero from comment #31) > > It's still odd behaviour, in both cases Chrome caps FPS to refresh rate (this > > case 85FPS), > > Sounds like Chrome just has its own framerate throttling which works > independently from sync-to-vblank. > > > > but using DRI3 using mutter/clutter, for some reason it creates > > continuous stutters, even tho FPS is the same and all other parameters are > > equal. It really looks (when viewed live) as if FPS is not equal to refresh > > rate. > > It's possible that the mutter framerate doesn't match the refresh rate (you > can check by setting GALLIUM_HUD=fps for the mutter process), but it's also > possible it's simply due to unfortunate interaction between the Chrome and > mutter frame timings. > > > > [...] it is still probably mutter/clutter configuration problem in the code > > (since it happens only there), it doesn't follow configuration in .drirc as > > other WM's. > > Not really. By setting vblank_mode=0, you're forcing mutter to run in a way > it doesn't intend. If doing so breaks something, that can hardly be > considered a mutter bug, and you get to keep all the pieces. :) You might be very right about unfortunate interaction between Chrome (and Chromium) and mutter frame timings, since I did tried "CLUTTER_DEFAULT_FPS=85" (and 84) env. value and it made 0 difference. Yeah, but by setting 1 and using any other WM results in Chromium/Chrome being VSYNC-ed, or at least it looks like it is, there's no tear line and picture is smooth as it can be (while on mutter/clutter there's tear line), so for the sake of standardisation i would call it mutter/clutter configuration bug that will probably stay unresolved, plus it doesn't explain DRI2 behavior that follows same standard :).
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