[PATCH] acpi-video: Fix backlight taking 2 steps on a brightness key press

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Hi All,

Here is my cleaned-up version of Linus' patch to fix the 2 steps on a
brightness key press problem.

Changes compared to Linus' version:
-Move the global variables to inside struct acpi_video_device
-Rebase on top of Rafael's linux-pm linux-next branch (so on top of the
 revert of changing the brightness_switch_enabled default)

I've tested this on a laptop affected by the 2 steps problem and I can confirm
that it fixes the 2 steps issue under normal usage. I managed to trigger the
race by generating a heavy io-load, as exptected hitting the race has no
unwanted side-effects other then taking 2 steps instead of one.

Bjørn can you test this patch on your system and confirm that it does not
break things for you please ? Note that in order to apply it you first need
to do: "git revert 886129a8eebebec", as the revert has not yet reached
Linus' tree AFAIK.

Regards,

Hans
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