[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 #10 from Marcin Zajaczkowski <mszpak at wp.pl> ---
(In reply to Ilia Mirkin from comment #9)
> (In reply to Marcin Zajaczkowski from comment #7)
> > > Providers: number : 2
> > > Provider 0: id: 0x6b cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 3 associated providers: 1 name:modesetting
> > > Provider 1: id: 0x45 cap: 0x2, Sink Output crtcs: 4 outputs: 2 associated providers: 1 name:modesetting
> > 
> > Hmm, why there are 3 and 4 outputs associated to them? Is it possible that
> > DP output is accessible with the Intel card only (I don't have a connector
> > right here to test it organoleptically)?
> 
> "crtcs: 4; outputs: 2". All modern NVIDIA GPU's have 4 CRTC's. You can see
> the full list of outputs with that grep command you ran.
> 
> You can now slave the nvidia GPU's outputs to the primary (intel) GPU:
> 
> xrandr --setprovideroutputsource 1 0
> 
> which should allow you to drive on your NVIDIA GPU's outputs by configuring
> them in xrandr.

In lxqt (with Openbox) after that command and "xrandr --output HDMI-1-2 --auto
--right-of eDP-1" the external monitor is turned on and I see a mouse cursor
there, but no window is rendered.

In Gnome 3 (with xorg) the external monitor is detected automatically, but the
effect is the same - black screen with a mouse cursor.

Can it be related to the fact that NVidia providers reports only "Sink Output",
but not offloading?

> This should also be possible with a Wayland compositor, however the
> specifics will vary by compositor. Xwayland has no ability to control screen
> setup.

In Wayland the external monitor works out-of-box in Gnome 3. However, I have
problem with bringing it to live with Xorg server (some tools I use don't like
Wayland). Is it possible to force LXQT or Gnome 3 (on xorg) to render also on
the external screen?

I've read about some issues with Windows Manager and "offloading", but though
it only applies to OpenGL-based output with PRIME=1.

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