[Bug 573984] Re: Screen brightness can not be adjusted in Lucid with Intel Arrandale graphics

[xassembler]

Acer Aspire 4740 (Ubuntu Linux 2.6.32-24) Solved:

1. Update BIOS firmware to version 1.09. (download from Acer web site and install in Windows) 
2. Edit /etc/default/grub file and add:
                        acpi_osi=Linux acpi_backlight=vendor
For example:
        $ sudo gedit /etc/default/grub
         GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
3. Update grub:
         $ sudo update-grub

Now arrows keys change brightness are working, but screen brightness
applet does not show up. And brightness is not automatically adjusted
when power cord has been unplugged. If you find a better solution let me
know.

Kind regards.

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Screen brightness can not be adjusted in Lucid with Intel Arrandale graphics
https://bugs.launchpad.net/bugs/573984
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