[Nouveau] [Bug 100446] New: Backlight control not working on Pascal / GP106 using nouveau drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100446

            Bug ID: 100446
           Summary: Backlight control not working on Pascal / GP106 using
                    nouveau drivers
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: carlo at caione.org
        QA Contact: xorg-team at lists.x.org

I'm currently working on an ASUS GL702VMK. This machine is shipping a GeForce
GTX 1060 GP106 (136000a1) connected to an internal DisplayPort on DFP-5 (usual
AU Optronics Corporation).

Using the unmodified latest nouveau drivers I have no backlight control.
Modifying nouveau_backlight.c adding a case for NV_DEVICE_INFO_V0_PASCAL I
finally get /sys/class/backlight/nv_backlight/ but changing the backlight value
in there is not working anyway.

Trying to manually poke NV50_PDISP_SOR_PWM_CTL(1) with `nvapoke` has no effect
whatsoever on the brightness (on or==1)

Backlight control is not working using the proprietary 375 / 378 drivers
either. Also in this case the value of NV50_PDISP_SOR_PWM_CTL is actually
changed by `xbacklight` but with no visible effect.

Any hint?

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