Nouveau - Jan 2016 - [Bug 93896] New: Nvidia GeForce GTX 970M unsupported, no backlight control

https://bugs.freedesktop.org/show_bug.cgi?id=93896

            Bug ID: 93896
           Summary: Nvidia GeForce GTX 970M unsupported, no backlight
                    control
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: jvoss at altsci.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 121344
  --> https://bugs.freedesktop.org/attachment.cgi?id=121344&action=edit
Video BIOS

The driver cannot load the firmware nvidia/gm204/fecs_inst.bin.
Xorg won't load the nouveau driver because Unknown chipset: NV124.
The backlight does not work.

The following commands have no affect on the brightness:
echo 2 |sudo tee /sys/class/backlight/acpi_video0/brightness
echo 10 |sudo tee /sys/class/backlight/acpi_video0/brightness

Brightness works with the proprietary nvidia driver.

If mmiotrace logs are beneficial, I will add them.

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--- Comment #1 from Javantea <jvoss at altsci.com> ---
Created attachment 121345
  --> https://bugs.freedesktop.org/attachment.cgi?id=121345&action=edit
dmesg on the affected system

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--- Comment #2 from Javantea <jvoss at altsci.com> ---
Created attachment 121346
  --> https://bugs.freedesktop.org/attachment.cgi?id=121346&action=edit
Xorg.0.log on the affected system

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--- Comment #3 from Karol Herbst <freedesktop at karolherbst.de> ---
update to 4.6 and install recent linux-firmware package

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--- Comment #4 from Javantea <jvoss at altsci.com> ---
Many thanks, great work on the GL support. Backlight is still not supported as
far as I can tell on kernel 4.6.2 and Mesa 11.2.2.

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--- Comment #5 from Pierre Moreau <pierre.morrow at free.fr> ---
Try the following patch:
https://lists.freedesktop.org/archives/nouveau/2016-May/025081.html. You should
be able to change the brightness through
`/sys/class/backlight/nv_backlight/brightness` with it.

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Javantea <jvoss at altsci.com> changed:

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

--- Comment #6 from Javantea <jvoss at altsci.com> ---
That fixed it. Thank you very much! Home users will want it to be connected to
xbacklight so that the fn controls will increase and decrease the backlight
intensity, but I am quite happy to run a script.

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