[Bug 105025] New: [Regression] Screen doesn’t light up again after turning brightness to 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105025

            Bug ID: 105025
           Summary: [Regression] Screen doesn’t light up again after
                    turning brightness to 0
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 137245
  --> https://bugs.freedesktop.org/attachment.cgi?id=137245&action=edit
Linux 4.15.2 messages with `drm.debug=14`

On the Dell XPS 13 9360 with Ubuntu 17.10 Linux 4.15.2 (and I believe since
4.14 or 4.15), turning down the brightness to 0 with the function keys, the
brightness isn’t increased, when pressing the appropriate keys. Only suspending
the system by closing the lid, the brightness is put back to the lowest level.

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