Comment # 16 on bug 1110041 from Stefan Dirsch

Well, I'm not convinced changing the behaviour would help to improve the
situation.

1) nvidia
nomodeset doesn't hurt afterwards when switching to NVIDIA driver unless you
want to use the experimental modeset feature of this driver,
which needs to be enabled manually (nvidia_drm.modeset=1). Otherwise you need
to use fbdev driver anyway unless updated kernels fix the issue with
modesetting in nouveau driver, which is unfortunately unlikely.

2) AMD
nomodeset is also still needed afterwards (fallback to fbdev driver) unless an
updated kernel fixes the issue in the radeon/amdgpu driver, which doesn't
happen often.

3) Optimus
Long, sad story. But easiest workaround is still disabling NVIDIA GPU in
BIOS/Firmware (if this is possible). Otherwise disabling nouveau driver
(kernel module) completely should  help. Which means intel only. Things are
improving a lot with Optimus on TW when using NVIDIA driver. See bsc#1103816.
But in that case you disable nouveau driver anyway.