https://bugs.kde.org/show_bug.cgi?id=497794
--- Comment #8 from PQCraft <0456...@gmail.com> ---
OK I guess this is what the problem was.
I installed evtest and went through all the event* devices in /dev/input.
Two devices were sending brightness keys at the same time.
- The 'event2' device which is the keyboard always sends the brightness key
events.
- The 'event8' device which is named "Dell WMI hotkeys" never sends brightness
key events for some reason.
- The 'event3' device which is named "Video Bus" and seems to be the problem
will send brightness key events until I put the laptop to sleep. After I wake
the laptop, it will no longer send brightness key events.
So the keyboard (event2) and video bus (event3) both send brightness key events
until I put the laptop to sleep. Once I wake the laptop, the video bus (event3)
device no longer sends brightness key events.
On top of that, there appears to be another device (event8) that looks like it
*can* send brightness key events but seemingly never does.
And to verify, I have the AMD-only model. It has the AMD integrated graphics
and that's it; no NVIDIA.
----------------------------------------------------------------------
/dev/input/event2 (responding to brightness keys both before and after sleep):
Input driver version is 1.0.1
Input device ID: bus 0x11 vendor 0x1 product 0x1 version 0xab83
Input device name: "AT Translated Set 2 keyboard"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
...
Event code 224 (KEY_BRIGHTNESSDOWN)
Event code 225 (KEY_BRIGHTNESSUP)
...
----------------------------------------------------------------------
/dev/input/event3 (responding to brightness keys before sleep, NOT responding
to brightness keys after sleep):
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x6 version 0x0
Input device name: "Video Bus"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 224 (KEY_BRIGHTNESSDOWN)
Event code 225 (KEY_BRIGHTNESSUP)
...
----------------------------------------------------------------------
/dev/input/event8 (NOT responding to brightness keys both before and after
sleep):
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x0 version 0x0
Input device name: "Dell WMI hotkeys"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
...
Event code 224 (KEY_BRIGHTNESSDOWN)
Event code 225 (KEY_BRIGHTNESSUP)
...
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