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When I press the Fn+F5 or Fn+F6, the sliders goes up or down, but the brightness won't change. I had the same issue on the Lucid Lynx, but I could fix adding ”quiet acpi_osi=Linux acpi_backlight=vendor splash” to the "GRUB_CMDLINE_LINUX=".

But on the 11.10, this solution won't work. If I try this workaround, the brightness slider stop working (show either maximum brigthness or minimum, but no change). If I add only "acpi_osi=Linux" the slider works, but still no change.

I'm desperate for a solution now, it's been months looking for it and it's really difficult to use the laptop with maximum brightness all-time. Some distros like OpenSUSE works fine, but I hate 'em.

My laptop:

Motherboard: Pegatron H24Z BIOS: American Megatrends 200.T67 Intel Core2Duo T6600 2GB RAM HD 500GB Brand: Positivo SIM+ (Brazillian PC-maker)

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closed as off topic by Amith KK, Thomas W., belacq, Ringtail, Stephen Myall Nov 11 '12 at 0:04

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Try installing a newer kernel, e.g. one from the Precise version. –  Lekensteyn Jan 31 '12 at 16:27
    
Have you reported a bug? –  RolandiXor Apr 4 '12 at 14:39
    
This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  coversnail May 22 '12 at 15:20

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