Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

So I cannot adjust my brightness at all. It is always at the max and I have tried updating the grub with acpi_osi=linux & acpi_backlight=vendor & acpi_osi= & acpi_osi=Linux acpi_backlight=vendor. Whenever I use the vendor the brightness bar just disappears from bightness and lock panel and I cannot use brightness key to get the bar. I'm not sure what I should do to fix this. I have also reinstalled my video drivers from amd. But have had no luck.

share|improve this question
Did you make sure to use "sudo update-grub"? (Sometimes people forget) Also some people have success when reinstalling bash (sudo apt-get install --reinstall bash) and make sure to reboot. – ever99 May 13 '14 at 6:49
Yes, I made to sure to do it after each one. – user2835532 May 13 '14 at 14:13

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.