[Bug 92866] "vbetool dpms on" doesn't work with i915 Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92866

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
vbetools can't work with i915 (by design since it uses root access to the Video
Bios which means writing to hardware registers owned by i915 and so causing
choas). But the bug here is that the intel_backlight doesn't work, and so
presumably this is a machine that must be quirked to provide acpi_backlight
instead.

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