[Bug 94245] Lubuntu 1404 Kernel 3.19 the DDI1_BKLTCTL is no signal at S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94245

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to shadow from comment #9)
> 
> The DDI1_BKLTCTL is PWM signal. It can be used at Windows OS. Does it not
> use at the Linux OS?

As Jani stated, the problem is that the port is identified as DP rather than
DP. Please attach a copy of /sys/kernel/debug/dri/0/i915_opregion so we can
check the VBT.

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