drm/i915: assume all GM45 Acer laptops use inverted backlight PWM
There is plenty of evidence suggesting all of the GM45 based Acer laptops (including their eMachines and Packard Bell brands) use inverted backlight PWM. Assume this is really the case, and quirk them all. The old bugs that were fixed by subsystem device specific quirks: * https://bugs.freedesktop.org/show_bug.cgi?id=59628 * https://bugzilla.kernel.org/show_bug.cgi?id=31522#c35 * https://bugs.freedesktop.org/show_bug.cgi?id=44156 * https://bugzilla.kernel.org/show_bug.cgi?id=53881 See also this bug and the plethora of duplicates: * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/765438 References: https://bugzilla.kernel.org/show_bug.cgi?id=54171Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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