** Changed in: mutter (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1763892
Title:
144Hz/120Hz monitor but mutter seems to cap rendering at 60FPS
Status in Mutter:
Fix Released
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Bionic:
Fix Committed
Status in mutter source package in Cosmic:
Fix Released
Status in mutter source package in Disco:
Fix Released
Bug description:
[Impact]
Gnome Shell redraws at 60 FPS at most, regardless of the hardware
refresh rate, and regardless of the current display mode. This is
particularly annoying for owners of 144Hz/120Hz/240Hz displays.
[Test Case]
0. Find a monitor or laptop with a high refresh rate (120Hz or more),
noting NOT to trust gnome-control-center or xrandr because an
unrelated bug in mutter may cause those to report 120Hz even on 60Hz
displays. Make sure the advertised hardware specs show the display is
a high frame rate.
1. Edit /etc/environment and add:
CLUTTER_SHOW_FPS=1
2. Reboot.
3. Open a terminal window and run:
journalctl -f | grep FPS
4. In a new window run 'glmark2' or some other OpenGL benchmark that
is not frame rate limited (note: glxgears for unrelated reasons IS
frame rate limited in Wayland sessions, but can be used in Xorg
sessions).
5. Verify the terminal window from step 4 shows high FPS values coming
from the journalctl log that match the hardware spec, and are much
higher than 60.
[Regression Potential]
Medium to low. This patch has been used upstream and in Ubuntu 19.04
for some months already without any issues. Although minor syntactical
changes had to be made to avoid conflicts when backporting it from
mutter 3.32 to mutter 3.30. If regressions did occur they would be
visible in the frame rate of the entire screen.
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