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

When I install the fglrx-experimental-13 driver that Steam recommends for my laptop (ATI Mobility Radeon HD 5000 Series) I have no backlight when I log in, but an external monitor works. I've tried a lot of backlight fixes suggested on the internet, but none of them seem to work.

I have also tried various other drivers including the drivers from the official AMD website, but both the beta and the stable drivers produce this error. Booting with acpi_backlight=vendor flag (or various other flags for that matter) doesn't work either. Pressing the hardware keys to change the backlight also doesn't work.

Any ideas how to solve this issue?

share|improve this question
Have you tried the latest version of Ubuntu to see if the backlight works with the Ati's binary driver ? Failing that the open-source Ati driver that comes with Ubuntu is getting a lot better in the new release due on the 15th Oct... – TenPlus1 Oct 1 '13 at 6:20
I have tried Ubuntu 12.04, 13.04, and 13.10 all with no luck. I would love to use the open source driver exclusively, but as far I know, it's not yet suitable for gaming unfortunately. – Devinrgates Oct 1 '13 at 11:32

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.