Created attachment 152368 [details]
The pseudo keys

SUMMARY

I have a Dell XPS 13 which has pseudo function keys. All of them work in KDE except for the volume up / down and mute. When I press them, there is no change to the volume, whether I have headphones plugged in or not.

If I go into shortcuts and attempt to map the keys to the volume events as custom shortcuts (on the theory that they are producing odd key event), I get a message saying that they are already mapped (i.e. so they are producing the right keyboard events). 

I unfortunately can't buy somebody one of these machines to debug with, but happy to provide any additional logs as needed.

Output of xev when pressing each of the keys is below.

```
KeyPress event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67346182, (-335,199), root:(536,724),
    state 0x0, keycode 123 (keysym 0x1008ff13, XF86AudioRaiseVolume), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67346303, (-335,199), root:(536,724),
    state 0x0, keycode 123 (keysym 0x1008ff13, XF86AudioRaiseVolume), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67348292, (-335,199), root:(536,724),
    state 0x0, keycode 122 (keysym 0x1008ff11, XF86AudioLowerVolume), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67348437, (-335,199), root:(536,724),
    state 0x0, keycode 122 (keysym 0x1008ff11, XF86AudioLowerVolume), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67351308, (-335,199), root:(536,724),
    state 0x0, keycode 121 (keysym 0x1008ff12, XF86AudioMute), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 39, synthetic NO, window 0x7200001,
    root 0x79f, subw 0x0, time 67351478, (-335,199), root:(536,724),
    state 0x0, keycode 121 (keysym 0x1008ff12, XF86AudioMute), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False
```

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Ubuntu 22.04
(available in About System)
KDE Plasma Version: 5.24.6
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3