[Bug 97295] New: Regression backlight control broken on Dell XPS13 w/ kernel 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97295

            Bug ID: 97295
           Summary: Regression backlight control broken on Dell XPS13 w/
                    kernel 4.7
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bugs at mrvanes.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I reported this bug on kernel bugzilla, but assumed it might be wise to inform
this bugtracker as well. On kernel 4.7 intel_backlight takes precedence over
acpi_video0 as backlight device, breaking backlight support on my IVB XPS13
again (1Hz pulsating brightness).

(New) Kernel bug: https://bugzilla.kernel.org/show_bug.cgi?id=151731
(Old) Freedesktop bug: https://bugs.freedesktop.org/show_bug.cgi?id=76276

Quick solution is the same as in comment #15, hard-disable the initialisation
of intel_panel_setup_backlight in intel_panel.c

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