Looking up this type of error message I end up here.
I have similar error message in my syslog . Seems to be related to function
keys like brightness or volume (hp pavilion notebook running ubuntu 20.04
with nvidia-drivers-460) .
here is an example with the brightness key :
Apr 29 22:30:30
nvidia_modeset
nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: gdm3156 F pulseaudio
chmick11493 F pulseaudio
/dev/snd/controlC1: gdm3156 F pulseaudio