On Tue, 2022-01-18 at 18:40 -0500, Sam Varshavchik wrote:
Rogan Dawes writes:
> have to reboot to allow the laptop to detect the screen again.
> Xrandr does
> not detect the display if run manually, and the Settings app
> Displays page
> also doesn't show the TV.
>
> This is a rather difficult thing to google, I have had zero results
> in my
> searching.
This seems to be a long running issue with various Nvidia cards, in
my
experience. If a monitor is present and powered on at boot time
everything is
fine. If the monitor gets powered off or disconnected it won't ever
come
alive again, until the next reboot. This is not limited just to
nvidia's
drivers. In all other respects my old geforce gtx 285 works just fine
with
nouveau; this is the only defect.
I have a single monitor connected via a KVM switch to two video
outputs, the onboard Intel and an NVidia GPU card. I use this setup for
VMs with GPU passthrough. The first switch I tried had exactly this
problem, i.e. if I switched away from the NVidia and then back again it
would remain off. I ended up getting a different model KVM switch that
maintains each of its connections "live" so the problem doesn't occur.
Possibly this is something the OP could consider.
poc