[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 #7 from Holger Schurig <holgerschurig at gmail.com> ---
@Jani, I attached 3 files which I made this way:
root:~# history 
    1  dmesg -c >1.txt
    2  vbetool dpms off
    3  dmesg -c >2.txt
    4  vbetool dpms on
    5  dmesg -c >3.txt

The funny thing: this time it worked. I did neither get the funny "Unclaimed
register before interrupt" error message ... (but I get other ERRORs!).

But more important: after "vbetool dpms on", why text screen was back there.


@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.

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