Bug 443727

Summary: Scroll mouse wheel -> Cycle through desktops not working for MX Master
Product: [Unmaintained] lattedock Reporter: Kristen McWilliam <kristen>
Component: applicationAssignee: Michail Vourlakos <mvourlakos>
Status: RESOLVED FIXED    
Severity: normal CC: mvourlakos, richard.llom
Priority: NOR    
Version First Reported In: 0.10.2   
Target Milestone: ---   
Platform: Manjaro   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Kristen McWilliam 2021-10-14 16:03:24 UTC 
SUMMARY

One of my mice is a Logitech MX Master, and for some reason scrolling on the taskbar to cycle desktops doesn't work with this specific mouse.


STEPS TO REPRODUCE
1. Scroll on empty part of task bar with MX Master

OBSERVED RESULT
None

EXPECTED RESULT
Change virtual desktop

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION


`evtest` for the MX Master:

```
Event: time 1634226719.154269, -------------- SYN_REPORT ------------
Event: time 1634226719.190266, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.190266, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226719.190266, -------------- SYN_REPORT ------------
Event: time 1634226719.286266, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.286266, -------------- SYN_REPORT ------------
Event: time 1634226719.330269, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.330269, -------------- SYN_REPORT ------------
Event: time 1634226719.354264, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.354264, -------------- SYN_REPORT ------------
Event: time 1634226719.378268, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.378268, -------------- SYN_REPORT ------------
Event: time 1634226719.850253, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.850253, -------------- SYN_REPORT ------------
Event: time 1634226719.874254, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.874254, -------------- SYN_REPORT ------------
Event: time 1634226719.890252, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.890252, -------------- SYN_REPORT ------------
Event: time 1634226719.898248, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.898248, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226719.898248, -------------- SYN_REPORT ------------
Event: time 1634226719.906250, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.906250, -------------- SYN_REPORT ------------
Event: time 1634226719.922250, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.922250, -------------- SYN_REPORT ------------
Event: time 1634226719.930251, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.930251, -------------- SYN_REPORT ------------
Event: time 1634226719.946250, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226719.946250, -------------- SYN_REPORT ------------
Event: time 1634226720.100250, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.100250, -------------- SYN_REPORT ------------
Event: time 1634226720.172251, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.172251, -------------- SYN_REPORT ------------
Event: time 1634226720.196248, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.196248, -------------- SYN_REPORT ------------
Event: time 1634226720.220248, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.220248, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226720.220248, -------------- SYN_REPORT ------------
Event: time 1634226720.236247, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.236247, -------------- SYN_REPORT ------------
Event: time 1634226720.262249, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.262249, -------------- SYN_REPORT ------------
Event: time 1634226720.276269, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.276269, -------------- SYN_REPORT ------------
Event: time 1634226720.302250, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.302250, -------------- SYN_REPORT ------------
Event: time 1634226720.490245, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.490245, -------------- SYN_REPORT ------------
Event: time 1634226720.568246, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.568246, -------------- SYN_REPORT ------------
Event: time 1634226720.592247, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.592247, -------------- SYN_REPORT ------------
Event: time 1634226720.608249, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -15
Event: time 1634226720.608249, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
```

`evtest` for my MX Vertical (which works as expected):

```
Event: time 1634226913.533252, -------------- SYN_REPORT ------------
Event: time 1634226913.903235, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226913.903235, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -120
Event: time 1634226913.903235, -------------- SYN_REPORT ------------
Event: time 1634226914.379228, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226914.379228, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -120
Event: time 1634226914.379228, -------------- SYN_REPORT ------------
Event: time 1634226914.717221, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226914.717221, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -120
Event: time 1634226914.717221, -------------- SYN_REPORT ------------
Event: time 1634226915.401212, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226915.401212, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -120
Event: time 1634226915.401212, -------------- SYN_REPORT ------------
Event: time 1634226915.797207, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1634226915.797207, type 2 (EV_REL), code 11 (REL_WHEEL_HI_RES), value -120
```

Looks like maybe the issue is the Master is only emitting the `REL_WHEEL` infrequently, and the Vertical always does.. I took a quick poke in the relevant code and the `QWheelEvent()` there is marked as depreciated: https://invent.kde.org/plasma/latte-dock/-/blob/d354cc45135d8ec41f96072dad493ccfa530e379/app/view/eventssink.cpp#L195 -- so wondering if perhaps the issue is even resolved by the new function, as QWheelEvent has a bunch of mentions of supporting high-resolution mouse wheels, but I am not familiar with any of it.
Comment 1 Richard Llom 2022-06-18 13:39:45 UTC 
Can you still reproduce this issue?
Comment 2 Kristen McWilliam 2022-06-18 15:22:31 UTC 
(In reply to Richard Llom from comment #1)
> Can you still reproduce this issue?

I just tried in KDE Neon, it seems to be working now! 👍