I believe I am experiencing this on 20.04
> (EE) open /dev/dri/card0: No such file or directory
The problem seems to be that gdm-wait-for-drm doesn't work for (muxless)
dual GPU laptops when using the dGPU.
GDM will start when only card1 is available, *both* card0 and card1 need
to be available
Public bug reported:
Release: Ubuntu 20.04
Package version: 1:0.8.1
gpu-manager will only configure X for PRIME render offloading when using
an Intel CPU with integrated graphics. AMD CPUs also have integrated
graphics that can support GPU offloading.
Upstream report: https://github.com/tseliot/
Proposed fix: https://github.com/tseliot/ubuntu-drivers-common/pull/40
** Patch added: "prime-offloading-with-amd.patch"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1878245/+attachment/5370444/+files/prime-offloading-with-amd.patch
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