[Bug 53491] New: 'xset dpms force off' breaks backlight

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=53491

           Summary: 'xset dpms force off' breaks backlight
           Product: Drivers
           Version: 2.5
    Kernel Version: latest from git
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: emailgrant at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


The backlight on my Dell XPS13 ultrabook works if I use this patch:

https://patchwork.kernel.org/patch/2102971/

Whether or not I use the patch, the backlight stops working if I issue 'xset
dpms force off'.  Issuing 'echo 0 >
/sys/class/backlight/intel_backlight/brightness' makes it work again.

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