Screen goes blank when adjusting brightness during DVD playback
Weird problem... I am using Slack 12.2 (upgraded from 12.1) on a laptop and the screen goes blank when attempting to adjust the brightness of the screen. I first noticed this when I accidentally unplugged the power supply from the laptop (which triggered an auto dimming feature to save power) while watching a DVD.
I am able now to replicate this whenever I play a DVD (using Kaffeine) and attempt to adjust the brightness. Normal brightness adjustments work fine.
Sometimes, the screen goes blank and I can still hear playback and I can restart the X server, other times the system hangs.
Not sure where to start here...