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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?

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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

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