[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 #11 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcin Zajaczkowski from comment #10)
> (In reply to Ilia Mirkin from comment #9)
> > 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.

I've seen a bunch of reports of this recently. It's not any issue with nouveau
kernel component itself, I think it's an Xorg issue. Try using a redirecting
compositor. Or not using one. Or using modesetting ddx. Or using nouveau ddx.

The lack of acceleration on TU* might also be playing into this. Not sure.

> 
> 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.

Offloading is usually meant as "perform rendering on secondary GPU, display on
primary GPU". This is what something like DRI_PRIME controls (i.e. which GPU
performs rendering for a particular application).

You want the inverse -- you want your primary GPU to generate images to be
displayed on a secondary GPUs outputs. In Xorg this is referred to as "reverse
PRIME".

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