This is a summary of what I have learned about GPU compatibility with Linux-libre from the help I received in these email threads:
Start Xorg server using xinit manually https://lists.gnu.org/archive/html/help-guix/2021-03/msg00197.html Two more computers unable to start X with GDM https://lists.gnu.org/archive/html/help-guix/2021-03/msg00250.html Starting Sway a Wayland window manager https://lists.gnu.org/archive/html/help-guix/2021-03/msg00268.html Corrections or further information is appreciated. Testing was done on two i686 computers and three x86_64 computers. 1) After installing the Guix operating system on a computer check if the directory /dev/dri/ exists. ** If it does *not* exist then your computer's GPU is *not* compatible with Linux-libre. ** If it does exist then your computer's GPU is compatible with Linux-libre. 2) If your GPU is not compatible with Linux-libre (see 1 above) then Xorg server and Wayland window managers will not work. 3) If your GPU is compatible with Linux-libre (see 1 above) but you have trouble getting Xorg server to work consider using a Wayland window manager. I was able to get Sway a Wayland window manager working on a computer that Xorg server was not working with. Note: If you use a Wayland window manager some programs that work with Xorg server may not work. There may be alternatives programs for those that do not work. I found this helpful: https://github.com/natpen/awesome-wayland
