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I'm getting this annoying behaviour (didn't occur on any of the previous releases), every time the display gets lock after typing the password the brightness is reset to 100%. But when I open the "Brightness & Lock" the brightness level is restored... Does anyone have a similar behaviour ?

Using Ubuntu 12.04 with Unity (i915) on a Asus N55SF.

Thanks in Advance

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    Problem solved by adding acpi_osi=Linux acpi_backlight=vendor to the line that begins with GRUB_CMDLINE_LINUX_DEFAULT= inside /etc/default/grub Dont forget to call update-grub after Thanks, Leandro – leandro May 17 '12 at 15:27
  • Hi. Request you to post a sample of the grub file, and highlight the changes you've done... – deostroll Jun 19 '12 at 16:26
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The OP post this answer as a comment:

Problem solved by adding acpi_osi=Linux acpi_backlight=vendor to the line that begins with GRUB_CMDLINE_LINUX_DEFAULT= inside /etc/default/grub. Dont forget to call update-grub after.

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