[kde] [Bug 485724] New: When using bluetooth mouse, KDE only registers every 8th scroll action.

bugzilla_noreply at kde.org bugzilla_noreply at kde.org
Thu Apr 18 10:56:59 BST 2024


https://bugs.kde.org/show_bug.cgi?id=485724

            Bug ID: 485724
           Summary: When using bluetooth mouse, KDE only registers every
                    8th scroll action.
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kdebugs at minelga.com
  Target Milestone: ---

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SUMMARY
When I use my Logitech MX Anywhere 3 mouse over bluetooth, I have to turn the
wheel 8 clicks for it to perform any scrolling action. Sometimes it starts
working in one or both directions after the initial 8 scroll actions, but it is
not persistent. `btmon` sees every scroll action, but only every 8th is
performed. 

Mouse `Scrolling speed` setting only impacts how much every 8th notch scrolls.

Here is what `btom` output looks like (one action in each direction, which were
not registered in KDE):

> ACL Data RX: Handle 76 flags 0x02 dlen 14                                                           #2 [hci0] 2.300707
     ATT: Handle Value Notification (0x1b) len 9
        Handle: 0x002a
          Data: 0000000000ff00
> ACL Data RX: Handle 76 flags 0x02 dlen 14                                                           #3 [hci0] 3.373249
      ATT: Handle Value Notification (0x1b) len 9
        Handle: 0x002a
          Data: 00000000000100

The exact same mouse works properly on other linux machine running sway, a
macbook running macos and an android device.

STEPS TO REPRODUCE
1. Use MX Anywhere 3 mouse over bluetooth
2. Scroll by 1 to 7 notches

OBSERVED RESULT
Nothing happens

EXPECTED RESULT
1 to 7 scroll actions happen

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
6.6.3-414.asahi.fc39.aarch64+16k
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Graphics Platform: Wayland

ADDITIONAL INFORMATION
I'm using it on MacBook Pro 2021 running asahi linux.

My reddit post (contains someone experiencing a similar bug on a VM):
https://www.reddit.com/r/kde/comments/1c64qgk/mouse_scrolling_skips_steps/
Someone having the same problem 3 years ago:
https://www.reddit.com/r/kde/comments/i9qui7/mouse_wheel_randomly_reverts_to_exceedingly_slow/g6fdia4/

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