Comme=
nt # 11
on bug 11083=
0
from Ilia Mirkin
(In reply to Marcin Zajaczkowski from comment #10)
> (In reply to Ilia Mirkin from comment #9)
> > xrandr --setprovideroutputsource 1 0
> >=20
> > which should allow you to drive on your NVIDIA GPU's outputs by c=
onfiguring
> > them in xrandr.
>=20
> In lxqt (with Openbox) after that command and "xrandr --output HD=
MI-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.
>=20
> 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 nouv=
eau
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 dd=
x.
The lack of acceleration on TU* might also be playing into this. Not sure.
>=20
> Can it be related to the fact that NVidia providers reports only "=
;Sink
> Output", but not offloading?
>=20
> > This should also be possible with a Wayland compositor, however t=
he
> > specifics will vary by compositor. Xwayland has no ability to con=
trol screen
> > setup.
>=20
> 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 do=
n't
> like Wayland). Is it possible to force LXQT or Gnome 3 (on xorg) to re=
nder
> also on the external screen?
>=20
> I've read about some issues with Windows Manager and "offloading&=
quot;, but
> though it only applies to OpenGL-based output with PRIME=3D1.
Offloading is usually meant as "perform rendering on secondary GPU, di=
splay on
primary GPU". This is what something like DRI_PRIME controls (i.e. whi=
ch 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".