I get the intuition behind the suggestion to aggregate using logind seats, as
far as it goes. But it still seems to me that this just pushes the question
back: how do you identify which card is which in order to assign it to a seat?
Normally this is done using udev rules, right? Additionally, I'
Maybe try creating multiple physical seats with logind, and start each
compositor on its own seat? A physical seat is a collection of devices like
DRM nodes and evdev device files.
Also udev creates files in /dev/dri/by-path/, these should be stable across
reboots. `udevadm settle` before a compos
I'm trying to find a robust way to handle the phrasing of UDev rules and
systemd dependencies about /dev/dri/cardXXX nodes to ensure that several
compositor services running on different graphics cards of a device all can
reliably start up.
First, some basic observations:
* The DRM su
