[Bug 81515] [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81515

--- Comment #4 from Hohahiu <rakothedin at gmail.com> ---
(In reply to comment #3)
> Try video.use_vendor_backlight=1.
> 
> Also "i915.i915_enable_rc6=7 i915.i915_enable_fbc=1 i915.lvds_downclock=1"
> is completely useless and more often dangerous. Fortunately for you the
> dangerous options in there do not match the module parameters.
> 
> If you look at the old kernel (best shown by the Xorg.log for 3.15) I guess
> it is using the acpi backlight.

Hello, Chris. Thanks you for your reply.

As you suggested I removed those kernel parameters. Also I tried
"video.use_vendor_backlight=1" and it did not help. According to dmesg this is
unknown parameter (see attached dmesg).

Also in 3.15.5 kernel my /sys/classs/backlight folder has three subfolders:
acpi_video0
acpi_video1
intel_backlight

So is there anything else I can try?

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