1826291 - [X11] Firefox is not suppressed if main window is not visible

Status: NEW

(Core :: Widget: Gtk, defect, P2)

Description

[Martin Stránský [:stransky] (ni? me)]

Firefox is not suppressed if main window is not visible under X11.

1. Open a OpenGL testcase (https://webglsamples.org/aquarium/aquarium.html)
2. maximize it
3. switch to different window
4. CPU is still utilized and Firefox eats 150% CPU

It affects only Firefox under X11. Firefox/Wayland works as expected.
Other browsers (Chrome/Chromium under X11) can suppress rendering in that case.

Comment 1

[Martin Stránský [:stransky] (ni? me)]

Attachment: wayland-run.txt

Comment 2

[Martin Stránský [:stransky] (ni? me)]

Attachment: x11-run.txt

Comment 3

[Martin Stránský [:stransky] (ni? me)]

Looks like we lost this ability in Bug 1723134 where X11/EGL was switched to swap interval 0 so we don't throttle rendering on X11 when window is hidden.

Comment 4

[Darkspirit]

EGL swap interval has been 0 even before that bug and seems to be required for Xwayland (bug 1635186 comment 49), EGL/Nvidia and GLX/Nvidia (it's still 1 for GLX: wontfix = bug 1716049 = WR/Nvidia has been switched to EGL or SW WR), otherwise one hidden window blocks rendering in all others.