[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 #7 from Marcin Zajaczkowski <mszpak at wp.pl> ---
(In reply to Ilia Mirkin from comment #6)
> (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.

You are right. Afew seconds after an external monitor is disconnected the
discrete card becomes DynOff.

I have a hard mux in my (quite) old Asus. I can use only the Intel card to save
energy and the Nvidia card is used only occasionally for CUDA and gaming. I
wonder why in multiple laptops nowadays the outputs are wired to one card
limiting the aforementioned use case? What are the benefits of that (assuming
the modern Intel can handle 3 displays enabled at the same time)?

> > 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:

Yes, it was Wayland. With Xorg I see two providers:

> 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)?

> 
> grep . /sys/class/drm/card*-*/status
> 
> You should see some card0-* and card1-* entries.

Yes, I see different outputs.
> /sys/class/drm/card0-DP-1/status:disconnected
> /sys/class/drm/card0-eDP-1/status:connected
> /sys/class/drm/card0-HDMI-A-1/status:disconnected
> /sys/class/drm/card1-DP-2/status:disconnected
> /sys/class/drm/card1-HDMI-A-2/status:disconnected

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