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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #8 from Pedro Albuquerque Santos <petersaints at gmail.com> ---
I have the same problem on an ASUS GL502VM with a GTX 1060 6GB. UNFORTUNATELY
this laptop shipped with G-SYNC enabled, which means that the Intel GPU is
completely disabled and everything goes through/is controlled by the NVIDIA
GPU. I would rather have no G-SYNC but having the Intel GPU driving the display
output and backlight. I'm sure that it would be a much less painful experience.

Well... Enough with ranting! Since you suggested that this may have been fixed
by a recent kernel update, I have tested a Fedora 28 Workstation Live Image
that comes with the 4.16rc6 kernel. But the problem persists.

>From what I could understand, even if the 4.16 corrects the underlying issue,
the nouveau driver still needs to be changed and manually recompiled as
suggested by the OP because backlight support for Pascal-based cards is not
enabled by that switch statement. The "NV_DEVICE_INFO_V0_PASCAL" clause is
missing in the "nvidia_backlight.c" file. Is this assessment correct?

Also, feel free to ask me for any further information that may help you to
fully support backlight control for Pascal GPUs. I may need some instructions
on how to gather some lower level information, but I'll gladly do it if you
think that it may help.

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