[Bug 55161] Backlight Software control is acting wrong

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55161





--- Comment #20 from Jani Nikula <jani.nikula at intel.com>  2013-04-10 09:50:59 ---
(In reply to comment #19)
> AWESOME IT WORKED!!!!!!
> there is a minor issue, but it will not stop me from using kernels > 3.6.11

Ooookay, in a strange way that sort of was not the answer I was hoping for,
because this means taming some BIOS dragons. But thanks for reporting back, and
at least you have a workaround now. :)

> The only issue is the Fn keys allow the brightness to go 4 steps over the
> maximum, there are 11 brightness levels (0-10) and 16 levels
> there are 5 levels that are 100%

Now I have a hunch about that too. Please mount the debugfs and attach the
output of 'hexdump < /sys/kernel/debug/dri/0/i915_opregion' (assuming that's
where the debugfs is mounted, etc.).

(Note to developers: I presume both issues are related to our ACPI opregion
handling, and changes in the way BIOS caters for Windows 8.)

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