Ubuntu's GNOME desktop rendering latency is higher than necessary
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| mutter (Ubuntu) |
Fix Released
|
Medium
|
Daniel van Vugt | ||
| Jammy |
Triaged
|
Medium
|
Daniel van Vugt | ||
| Kinetic |
Won't Fix
|
Medium
|
Daniel van Vugt | ||
| Lunar |
Fix Released
|
Medium
|
Daniel van Vugt | ||
Bug Description
[ Impact ]
Ubuntu's GNOME desktop is higher latency than necessary. It's stuck in triple buffering when it should be dropping to double buffering during light rendering.
[ Test Plan ]
1. Add this to /etc/environment:
MUTTER_
2. Reboot and log into a Wayland session.
3. Open a Terminal and run:
journalctl -f /usr/bin/
4. Drag the Terminal window rapidly with the mouse (a high sample rate mouse will also help).
Observed bug: "KMS: Swap buffers: 2 frames pending (triple-buffering)"
Expected fix: "KMS: Swap buffers: 1 frames pending (double-buffering)"
If you don't at first confirm the bug prior to the fix then try dragging the window to the top bar before wiggling it or opening the overview to make the render load higher. The fix will make the log messages return to double buffering much sooner and stay there more reliably.
[ Where problems could occur ]
Any part of the smoothness of the desktop experience could be impacted since the fix involves changing the frame clock for frame scheduling.
[ Other Info ]
Upstream fix: https:/
| Changed in mutter (Ubuntu): | |
| assignee: | nobody → Daniel van Vugt (vanvugt) |
| status: | New → In Progress |
| description: | updated |
| Daniel van Vugt (vanvugt) wrote | #1 |
| description: | updated |
| description: | updated |
| Changed in mutter (Ubuntu Kinetic): | |
| assignee: | nobody → Daniel van Vugt (vanvugt) |
| Changed in mutter (Ubuntu Jammy): | |
| assignee: | nobody → Daniel van Vugt (vanvugt) |
| Changed in mutter (Ubuntu Kinetic): | |
| status: | New → Triaged |
| importance: | Undecided → Medium |
| Changed in mutter (Ubuntu Jammy): | |
| importance: | Undecided → Medium |
| status: | New → Triaged |
| Changed in mutter (Ubuntu Lunar): | |
| status: | In Progress → Fix Committed |
| Changed in mutter (Ubuntu Lunar): | |
| status: | Fix Committed → Fix Released |
| summary: |
- Ubuntu's GNOME desktop is higher latency than necessary + Ubuntu's GNOME desktop rendering latency is higher than necessary |
| Changed in mutter (Ubuntu Kinetic): | |
| status: | Triaged → Won't Fix |
The lunar fix is proposed in:
https:/