https://bugs.freedesktop.org/show_bug.cgi?id=110407

            Bug ID: 110407
           Summary: /sys/class/backlight/nv_backlight doesn't work on Dell
                    Precision 7530 GP107GLM [Quadro P1000 Mobile]
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: kai.heng.feng-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

This laptop has an BIOS option "Switchable Graphics". When the options is
selected, it behaves like a normal Optimus laptop. In this case, brightness
sysfs works since it's driven by Intel graphics.

When the options is deselected, the Intel graphics device disappears, Nvidia is
the only graphics device. The issue happens in this case.

Changing /sys/class/backlight/nv_backlight/brightness, the brightness level
remains the same - almost no backlight.

Using proprietary driver, brightness gets changed correctly by
/sys/class/backlight/nvidia_0/brightness.

No trace while using MMIOTRACE, under proprietary driver.

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