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[tankdriver <446717@xxxxxxxxxxxxxxxxxx>]

Here is a workaround to set the Brightness via shell:
~$ sudo setpci -s 00:02.0 F4.B=75      
(to set Brightness to 75%)
be careful with low values, 00 is completely black.

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https://bugs.launchpad.net/bugs/446717

Title:
  [gm45] Adjusting Brightness in Acer Aspire Timelines causes system freeze in 4810T and 5810T models