I've narrowed it down further to just GTK4. The
ubuntu-26.10-snapshot2-desktop-amd64.iso live session does not have the
bug initially and then does after only upgrading GTK4 from 4.22.4 to
4.23.2.
Forget about Firefox because it seems to have its own separate
performance issues that come and go at different times.
** Changed in: glib2.0 (Ubuntu)
Status: New => Invalid
** Changed in: gnome-control-center (Ubuntu)
Status: New => Invalid
** Changed in: mesa (Ubuntu)
Status: New => Invalid
** Description changed:
- 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.
-
+ 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-based as well as Firefox, suggesting it
- might be double-buffered apps (Mutter's fault in frame scheduling), if
- not a regression in GTK.
-
Workaround:
Change the Power Mode to Performance to get smooth scrolling back.
** Description changed:
- Kinetic scrolling is stuttering in 26.10 for some apps, whereas it doesn't in
26.04 on the same machine.
+ 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.
Workaround:
Change the Power Mode to Performance to get smooth scrolling back.
** Changed in: gtk4 (Ubuntu)
Importance: Undecided => Medium
** Changed in: gtk4 (Ubuntu)
Status: New => Triaged
** Changed in: gtk4 (Ubuntu)
Milestone: None => ubuntu-26.10
** Changed in: gtk4 (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to glib2.0 in Ubuntu.
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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https://bugs.launchpad.net/ubuntu/+source/glib2.0/+bug/2164623/+subscriptions
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