We should only animate the screen brightness if there are enough steps available to make for a smooth transition. This check was forgotten for the new sysfs brightness animation.
BUG: 426883 FIXED-IN: 5.20.0
Animation unchanged on my machine, changed
To simulate added the following into
Brightness wasnt animated anymore
The default threshold is 100, so should fix the bug reporter's machine where there are only 15 setps.
I'd like a respin for 5.20 powerdevil, please, sorry.