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Accepted
James
Asked: 2010-12-30 23:51:29 +0800 CST

Brightness control not working on HP Pavilion dm3t (Intel GMA 4500MHD)

  • 772

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.

I asked this on superuser.com and someone commented that I should play around with the intel hd drivers. I'm a total noob -- how do I do that? What else can I try? I really don't want to go back to windows.

10.10 intel-graphics brightness hp

2 Answers

  1. Best Answer

    This seems to be a kernel bug.

    You might be interested in reading this bug report, where an Ubuntu kernel developer posted a link to his PPA with a patched kernel (including steps on how to install it).

    • 3

  2. Try this.

    sudo -H gedit /etc/default/grub

    Change the line GRUB_CMDLINE_LINUX="" into 

    GRUB_CMDLINE_LINUX="acpi_osi=Linux"

    Run

    sudo update-grub

    Restart your Linux

    Credit to this guy

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