Public bug reported:
Kinetic scrolling is stuttering in 26.10 for some apps, whereas it
doesn't in 26.04 on the same machine. This makes web browsing with
Firefox in 26.10 a noticeably less smooth experience than in 26.04 on
the same machine.
Test case:
1. Make sure the power mode is Balanced (not Performance).
2. Open: Settings > Mouse & Touchpad > Touchpad > Test Settings > Scrolling
3. Fling the image with the touchpad (two fingers) or with a touchscreen.
4. Expect: The image scrolls smoothly.
The affected apps so far are GTK-based as well as Firefox, suggesting it
might be double-buffered apps (Mutter's fault in frame scheduling), if
not a regression in GTK.
** Affects: mutter (Ubuntu)
Importance: Medium
Assignee: Daniel van Vugt (vanvugt)
Status: In Progress
** Tags: performance regression stonking udeng-11241
** Changed in: mutter (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: mutter (Ubuntu)
Milestone: None => ubuntu-26.10
** Changed in: mutter (Ubuntu)
Status: New => In Progress
** Description changed:
Kinetic scrolling is stuttering in 26.10 for some apps, whereas it
doesn't in 26.04 on the same machine.
Test case:
1. Make sure the power mode is Balanced (not Performance).
2. Open: Settings > Mouse & Touchpad > Touchpad > Test Settings > Scrolling
3. Fling the image with the touchpad (two fingers) or with a touchscreen.
4. Expect: The image scrolls smoothly.
- The affected apps so far are GTK and Firefox, suggesting it might be
- double-buffered apps (Mutter's fault in frame scheduling), if not a
- regression in GTK.
+ The affected apps so far are GTK-based as well as Firefox, suggesting it
+ might be double-buffered apps (Mutter's fault in frame scheduling), if
+ not a regression in GTK.
** Description changed:
Kinetic scrolling is stuttering in 26.10 for some apps, whereas it
- doesn't in 26.04 on the same machine.
+ doesn't in 26.04 on the same machine. This makes web browsing with
+ Firefox in 26.10 a noticeably less smooth experience than in 26.04 on
+ the same machine.
Test case:
1. Make sure the power mode is Balanced (not Performance).
2. Open: Settings > Mouse & Touchpad > Touchpad > Test Settings > Scrolling
3. Fling the image with the touchpad (two fingers) or with a touchscreen.
4. Expect: The image scrolls smoothly.
The affected apps so far are GTK-based as well as Firefox, suggesting it
might be double-buffered apps (Mutter's fault in frame scheduling), if
not a regression in GTK.
** Changed in: mutter (Ubuntu)
Importance: Undecided => Medium
** Tags added: udeng-11241
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https://bugs.launchpad.net/bugs/2164623
Title:
[regression] Kinetic scrolling is stuttering in 26.10 (it doesn't in
26.04)
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