[Bug 108618] New: Setting minimal brightness level on HP EliteBook Folio G1 and HP Elite x2 1013 G3 turn off backlight

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108618

            Bug ID: 108618
           Summary: Setting minimal brightness level on HP EliteBook Folio
                    G1 and HP Elite x2 1013 G3 turn off backlight
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142318
  --> https://bugs.freedesktop.org/attachment.cgi?id=142318&action=edit
dmesg drm-tip 2018-11-01 from HP Elite x2 1013 G3

Hello!

Some HP devices (probably many) such as HP EliteBook Folio G1 and HP Elite x2
1013 G3 turn off backlight if user set minimal brightness level. Due to
unresolved issues with hp_wmi brightness hotkeys doesn't work, so user left
with black screen and no convenient option that would let him turn backlight on
again. (Hence major severity.)

I propose to limit minimal brightness level for such devices to prevent
backlight from turning off.

debug dmesg from drm-tip 2018-11-01 (9458f0c67b519ddf1c2b4eec9110e826c4e7d2f3)
run on HP Elite x2 1013 G3 is attached. I set maximum brightness, then minimal
(backlight disabled) and then increase backlight to save dmesg log.

Issue is reproducible at least since Linux 4.13 (was tested on HP EliteBook
Folio G1 , earlier releases not tested).

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