[Bug 110407] New: /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

[Bug 110407] New: /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

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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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[Bug 110407] /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

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

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
When in non-switchable mode, are there other things in /sys/class/backlight?
e.g. acpi_video0?

Also, presumably this is on v5.0 or later? Prior to that, there was no
backlight support for Pascal.

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[Bug 110407] /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

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

--- Comment #2 from Kai-Heng Feng <kai.heng.feng-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> ---
(In reply to Ilia Mirkin from comment #1)
> When in non-switchable mode, are there other things in /sys/class/backlight?
> e.g. acpi_video0?

No, nv_backlight (or nvidia_0) is the only interface.

I also tried to call _BCM directly via acpidbg, but both Intel's and Nvidia's
_BCM method changes nothing.

Please refer to the original bug report [1].

> 
> Also, presumably this is on v5.0 or later? Prior to that, there was no
> backlight support for Pascal.

Yes, on both v5.0 and linux-next.

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821882

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[Bug 110407] /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

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

--- Comment #3 from Kai-Heng Feng <kai.heng.feng-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> ---
Any further ideas that I can try?

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[Bug 110407] /sys/class/backlight/nv_backlight doesn't work on Dell Precision 7530 GP107GLM [Quadro P1000 Mobile]

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

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #4 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/483.

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