[Bug 81515] New: [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

          Priority: medium
            Bug ID: 81515
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB Regression] Backlight is not adjustable and set
                    at maximum level in kernels 3.16-rcX on HD 4000
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rakothedin at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 103070
  --> https://bugs.freedesktop.org/attachment.cgi?id=103070&action=edit
dmesg for kernel 3.16-rc5

[IVB Regression] Backlight is not adjustable and set at maximum level in
kernels 3.16-rcX on HD 4000. I tried a couple of release candidates without
luck. I checked /sys/class/backlight and found subfolder intel_backlight there.
However changing brightness manually does not result in any change of the
backlight level. For comparison, kernels 3.15 work just fine.

My hardware:
Laptop HP Envy 15 with hybrid intel\amd graphics:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Chelsea LP [Radeon HD 7730M] (rev ff)

Software:
kernel 3.16-rc5
Mesa and libdrm are both from git
x-server is 1.16.0

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