[Bug 86936] New: Facilitate override on minimum brightness level

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86936

            Bug ID: 86936
           Summary: Facilitate override on minimum brightness level
           Product: DRI
           Version: DRI git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mail at aurabindo.in
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110359
  --> https://bugs.freedesktop.org/attachment.cgi?id=110359&action=edit
/sys/kernel/debug/dri/0/i915_opregion

Recent changes made the minimum allowed brightness level from 0 to an arbitrary
value of 25% (of Max value).

Such an arbitrary value may not be suitable for all users alike. However, it
also fixes some issues on a few hardware. Hence facilitate an override for
systems that work sanely without limit on minimum brightneess.

Mailing list thread: http://www.gossamer-threads.com/lists/linux/kernel/2060904

Associated commit:

commit e1c412e75754ab7b7002f3e18a2652d999c40d4b
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Wed Nov 5 14:46:31 2014 +0200

    drm/i915: safeguard against too high minimum brightness

    Never trust (your interpretation of) the VBT. Regression from

    commit 6dda730e55f412a6dfb181cae6784822ba463847
    Author: Jani Nikula <jani.nikula at intel.com>
    Date:   Tue Jun 24 18:27:40 2014 +0300

        drm/i915: respect the VBT minimum backlight brightness

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