[Bug 43577] [SNB] KMS with intel sandy bridge video sets brightness to zero.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43577

--- Comment #51 from Gustavo Vieira <gustavo at sagui.org> ---
Found the problem and a solution. Apparently it is a BIOS bug where it is
claimed the display uses minimum backlight at boot. 

More info: https://bugzilla.kernel.org/show_bug.cgi?id=21212 and
https://bugzilla.kernel.org/show_bug.cgi?id=51141

The solution is to put video.use_bios_initial_backlight=0 in the kernel command
line. A more definitive fix is to add this laptop to a white list of machines
needing this parameter. I've made a patch to fix it and have sent it to the
ACPI list: http://www.spinics.net/lists/linux-acpi/msg42467.html

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