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I used Ubuntu 11.10 on Acer Aspire 4750 with Intel HD Graphics. When I made it up looks like Linux Mint 12, the graphics card was detected as Intel Sandy Bridge x86/MM2.

But I still got problem with the brightness. It didn't work, as I had to try some tricks like editing the GRUB, but it still didn't work. Please help me

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Try the following and see if it will enable the brightness after a reboot:
Edit the file etc/X11/xorg.conf and add the line Option "RegistryDwords" "EnableBrightnessControl=1" to the Screen section.


Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "RegistryDwords" "EnableBrightnessControl=1"
    Option         "NoLogo" "True"
    SubSection     "Display"
        Depth       24
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Try installing the Proprietary drivers. Other than that, then it may be an issue with ubuntu not being able to control your monitor brightness

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