Wayland with dual GPU uses the wrong monitor for rendering

seth · 2024-05-30 14:43:48

I want each GPU to render the monitors that are attached to it

that's NOT what you get in in your X11 setup and will NOT allow you to run this as combined screen - your ARE running X11 in a reverse prime setup!

But you should™ be able to run an independent gnome session on either output (with two keyboards and mice etcetc) - the tricky part is to tell gnome which GPU to use, because controlling that via a device tag means you're not gonna be able to select this sequentially. You'll also have to dbus-launch one of the sessions to prevent the session būs from colliding.

A rather clumsy workaround would be to blacklist one of the GPU drivers until the first gnome session as started, then load the driver manually and equip it w/ the device tag so the next gnome session will run on it…

Never forget: wayland is the future. Not the present.

Lone_Wolf · 2024-05-31 10:02:49

odror wrote:

For example if I have NVDIA and AMD GPU under X11 or MS windows. Each GPU renders the monitors that are connected to it.

That only works on a system where both those cards are discrete videocards. Your system has one integrated videocard and a discrete one.

seth · 2024-05-31 12:11:49

As long as both provide CRTCs (ie. neither is a pure 3D device) you can run independent X11 servers on each. Just because one of the VGA devices is embedded in your CPU doesn't have much impact on this.
I just very much doubt that this is actually what the OP wants and it's most certainly how their X11 operates right now.

Arch Linux

#26 2024-05-30 14:43:48

Re: Wayland with dual GPU uses the wrong monitor for rendering

#27 2024-05-31 10:02:49

Re: Wayland with dual GPU uses the wrong monitor for rendering

#28 2024-05-31 12:11:49

Re: Wayland with dual GPU uses the wrong monitor for rendering

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