Comment 16 for bug 281951

I've fixed the brightness bug by removing the video module.

I.e. I inserted the following line in /etc/modprobe.d/blacklist and rebooted my laptop:
  blacklist video

This is a trial-and-error workaround, I don't know if it's a good thing to remove this module or not, I just know that it fixes the bug in my laptop.

P.s. you may use the following one-liner:
  while cat /sys/class/backlight/acer-wmi/actual_brightness; do sleep 0.1; done
to see the brightness value, while pressing the brightness keys:
a) Increasing two by two, before removing the module,
b) Increasing one by one, after removing the module

So now I think absolutely everything is working OK with Acer Aspire 5920G, I don't think I have any problem at all.

Charlie, can you send me the forum topic link? I can't find it... :)