Dual-GPU support follow-up: NVIDIA driver support
There were a number of problems with the old detection code in switcheroo-control:
- it required the graphics card to use vga_switcheroo in the kernel, which the NVIDIA driver didn't do
- it could support more than 2 GPUs
- and it didn't really actually know which GPU was going to be the “main” one
And, on top of all that, gnome-shell expected the Mesa OpenGL stack to be used, so it only knew the right environment variables to do that, and only for one secondary GPU.
So we've extended switcheroo-control and its API to do all this.
(As a side note, commenters asked me about the KDE support, and how it would integrate, and it turns out that KDE's code just checks for the presence of a file in /sys, which is only present when vga_switcheroo is used. So I would encourage KDE to adopt the switcheroo-control D-Bus API for this)
Also: GNOME 3.36 Bringing Better Multi-GPU Handling With Switcheroo-Control, NVIDIA Support
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GNOME 3.36 and Fedora 32 to get better GPU switching
GNOME 3.36 and Fedora 32 to get better GPU switching with NVIDIA support