[Nouveau] [Bug 110830] [nouveau] GeForce GTX 1660 Ti (mobile) not supported (NV168/TU116)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110830

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcin Zajaczkowski from comment #4)
> Of course it didn't make sense to turn it on, as it was already turned on
> (DynPwr) in my case :) ). I can switch it off with vgaswitcheroo (or at
> least to be reported as DynOff - I will check it later with powertop) when
> no external output is connected. And what I missed in my previous comment -
> the external monitor works out-of-box, which is nice progress.

vgaswitcheroo explicit control is for hard muxes. These were popular 2005 to
2010 or so. You just have 2 GPUs. vgaswitcheroo reports whether they're on or
off, but that control is performed dynamically by the driver based on usage.

> 
> Later on I will try to play with DRI_PRIME to enable also rendering with the
> NVidia card.
> 
> What could be the side effects of:
> > kernel: nouveau 0000:01:00.0: DRM: failed to create kernel channel, -22
> ?

No acceleration. This means that DRI_PRIME will not do anything.

> There are also no reported providers in xrandr:
> > $ xrandr --listproviders
> > Providers: number: 0

This is incredibly odd -- there must always be at least 1! Are you running
Xwayland or something? If so, the displays would be controlled through your
wayland compositor. You can check that kms is working:

grep . /sys/class/drm/card*-*/status

You should see some card0-* and card1-* entries.

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