https://bugzilla.kernel.org/show_bug.cgi?id=47841





--- Comment #20 from Corentin Chary <corentin.ch...@gmail.com>  2012-12-04 
09:05:23 ---
Ok, that's a first step. Is the backlight updated when you press the key ?
Can you try to boot with acpi_backlight=video and check again ?

Then, could you try with this patch:
https://github.com/iksaif/platform-drivers-x86/commit/c8d90c640cc309b1b3d47f4503cf6e57e50be69d.patch
?

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