commit c675949ec58ca50d5a3ae3c757892f1560f6e896
drm/i915: do not setup backlight if not available according to VBT
caused a regression on machines with a misconfigured VBT. Add a quirk to
assert the presence of a controllable backlight, overriding the VBT. Then
apply this quirk to four Haswell-based Chromebook laptops.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
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