(built-in) volume up/down buttons ignored by keyd

[Garbaz]

Hi,

My laptop (Surface Go 2) has built in volume up/down keys like a Smartphone or Tablet usually has. I also have a little Bluetooth camera remote that in effect is just a input device sending volumedown/volumeup events.

However, while the events of both show up in showkeys, neither of these devices are found by keyd. They neither show up in keyd monitor, nor does this:

...
volumedown = nextsong
volumeup = playpause
...

in the /etc/keyd/default.conf change their behavior (while the volume up/down keys on my regular keyboard do change behavior, so the config is fine).

Running KEYD_DEBUG=2 keyd monitor as the person in this issue does, I do get:

...
DEBUG: src/device.c:134: capabilities of /dev/input/event13 (Intel HID 5 button array): 0
...
DEBUG: src/device.c:134: capabilities of /dev/input/event26 (UBeesize): 0
...

Intel HID 5 button array is the media keys. UBeesize is the Bluetooth remote. It appears they are both detected to have no "capabilities" and therefore are ignored by keyd (?)

Question 1: Is it possible to just disable this check for capabilities? I assume it is only there for optimization, as not to listen to devices that are deemed not to send relevant input events.

Question 2: Would something similar to this PR be possible to resolve this issue? Yes, see PR #832.