Nouveau - Feb 2018 - [Bug 104898] New: backlight problem with the NVIDIA G96GLM [Quadro FX 770M]

https://bugs.freedesktop.org/show_bug.cgi?id=104898

            Bug ID: 104898
           Summary: backlight problem with the NVIDIA G96GLM [Quadro FX
                    770M]
           Product: xorg
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: estellnb at elstel.org
        QA Contact: xorg-team at lists.x.org

There is a problem with the backlight of my FTS Celsius H265 notebook and its
NVIDIA G96GLM [Quadro FX 770M] graphics card. When I leave my computer
unattended for a while Xfce turns off the backlight of my computer as there is
no input. However as soon as it does so my screen stays permanently black. When
I move the mouse the backlight goes on again; however the screen content
remains black. The same problem occurs with s2ram; after awaking from s2ram
Num-Lock works well but the screen stays black. However to evoke this error it
isn`t necessary to s2ram; the desktop environment just needs to switch the
backlight off. - using kernel 4.15.0-rc9+.

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--- Comment #1 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 137375
  --> https://bugs.freedesktop.org/attachment.cgi?id=137375&action=edit
systool -c backlight -v ... before suspend

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--- Comment #2 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 137376
  --> https://bugs.freedesktop.org/attachment.cgi?id=137376&action=edit
systool -c backlight -v ... after suspend

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--- Comment #3 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 137377
  --> https://bugs.freedesktop.org/attachment.cgi?id=137377&action=edit
systool -c drm -v ... before suspend

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--- Comment #4 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 137378
  --> https://bugs.freedesktop.org/attachment.cgi?id=137378&action=edit
systool -c drm -v ... after suspend

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--- Comment #5 from Elmar Stellnberger <estellnb at elstel.org> ---
Tried to record any changes of device parameters before and after suspend
above. However the same values seem to change across reboots as well.

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--- Comment #6 from Karol Herbst <karolherbst at gmail.com> ---
can you check if this patch fixes it for you?

https://lists.freedesktop.org/archives/nouveau/2018-February/029869.html

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--- Comment #7 from Elmar Stellnberger <estellnb at elstel.org> ---
  No, unfortunately the given patch did not resolve the backlight issue for me.

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #8 from Martin Peres <martin.peres at free.fr> ---
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