[Bug 92866] intel_backlight doesn't work with i915 Haswell

[bugzilla-daemon at freedesktop.org]

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

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Holger Schurig from comment #7)
> @Chris: if vbetool would't generally not work with i915, when why did it
> work with the i915 with PCI id 8086:a011, or why did it work when the drm
> debug output changed the timing :-)    BTW, my kernel doesn't have
> CONFIG_X86_LEGACY_VM86 set, so I'm unsure if/how it can access the video
> BIOS. But this is just a guess, I've not really looked into this.

Pure circumstance. vbetool accesses hardware registers and disregards that
those registers are under the control of an actual hardware driver, just as we
will disregard bug reports where vbetool has been used.

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