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I picked up an hp dm3t laptop with intel HD graphics and installed ubuntu 10.10 64 bit on it. It works great -- the only problem is that the brightness controls on the keyboard don't work. The brightness is always at full. When I try to adjust it down, the indicator graphic indicates that it's going down but the actual brightness doesn't change. Is there anything that I can try to make this work? I'd really appreciate any help.

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must be the intel HD graphics....works for me with an HP and nvidia. try tweaking the driver –  hbdgaf Dec 30 '10 at 1:30
    
What should I tweak and where? Thanks –  James Dec 30 '10 at 5:06
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1 Answer

  1. Run this command:

    sudo gedit /etc/default/grub
    
  2. Change the line:

    GRUB_CMDLINE_LINUX=""
    

    into

    GRUB_CMDLINE_LINUX="acpi_osi=Linux"
    
  3. Then run:

    sudo update-grub
    
  4. Restart Linux.

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