[Powerdevil] [Bug 360537] Keyboard Backlight endless loop when changed, only inside plasma session

[Fuchs via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360537

--- Comment #2 from Fuchs <develop at fuchsnet.ch> ---
Ignore the last comment, actual issue is the following: 

per default the key triggers keycode 236 (keysym 0x1008ff04,
XF86KbdLightOnOff), which by default in KDE Plasma is configured to toggle the
keyboard light. However, at the same time the keyboard light is changed by the
BIOS. This seems to get plasma / powerdevil in a confused state so it doesn't
stop cycling through them. 

If somehow possible, I highly recommend disabling that default keybinding on
affected thinkpads. If not possible some logic will be needed to avoid that,
because otherwise owners of affected hardware will run into this issue with
recent kernels and KDE plasma, changing their keyboard brightness leading to an
endless cycle  (which, as a side effect, triggers the lovely pop up which won't
disappear either. In short: the session is rendered quite unusable) 

If I can somehow help resolving this issue  (xev or dbus monitor logs or
whatnot): let me know. 

Workaround for me: disable that keybinding in systemsettings.

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