[Bug 76276] New: Backlight control broken on Dell XPS13 w/ kernel 3.14-rc7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76276

          Priority: medium
            Bug ID: 76276
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Backlight control broken on Dell XPS13 w/ kernel
                    3.14-rc7
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: romain at orebokech.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 95952
  --> https://bugs.freedesktop.org/attachment.cgi?id=95952&action=edit
dmesg of broken kernel with drm.debug=0xe

On a Dell XPS13 (IVB version), backlight control is broken with v3.14-rc7, it
was previously working with v3.13. Reverting patch bc0bb9fd1c78 ("drm/i915:
remove QUIRK_NO_PCH_PWM_ENABLE") gets things working again.

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