second monitor suddenly not detected

[Colin Law]

On Mon, 28 Sep 2020 at 00:28, R C <cjvijf at gmail.com> wrote:
>
>
> wasn't on Ubuntu, but if that happened, and I disconnected the monitor
> that was working, booted it 'cold'  it would see/use it . then
> reconnected the monitor that was working before and they both were
> detected (but mirrored, which was easy to fix)  That was with an NVIDIA
> card btw.

Another thing that could be looked at is to unplug it, reboot monitor
the log (sudo journalctl -f, or tail -f syslog if  you prefer) plug it
in and see what appears.

Colin

>
>
>
>
>
>
>
> On 9/27/20 4:46 PM, Karl Auer wrote:
> > On Mon, 2020-09-28 at 00:04 +0200, Liam Proven wrote:
> >> Create a new account; see if it is affected?
> > Already done. No change.
> >
> >> Doesn't it? I found this very quickly:
> >> https://askubuntu.com/questions/67764/how-to-remove-and-reinstall-gnome-3
> > That is about how to re-install gnome shell. This problem sems to be
> > way below gnome-shell. But I will give it a go anyway; perhaps
> > installing gnome-shell installs the entire video subsystem it needs.
> >
> > Have you checked your disk for errors with `fsck`?
> >
> > No - but it's been rebooted a few times, which I thought did a check.
> > I'll check the check :-)
> >
> >>> It means I selected GNOME via the cog icon at login, instead of
> >>> Ubuntu.
> >> OK. As I said: I do not run Ubuntu with GNOME and so I do not know
> >> what the options available there are, and you are not helping me here
> >> by telling me!
> > Let me be clearer then: I have absolutely no idea what the two options
> > do in terms of X.org vs Wayland. I'm sorry...
> >
> >> I *think* from the last time I tried it, a year or 2 back maybe, that
> >> there were options for:
> > On my system there are two, and they are called "GNOME" and "Ubuntu".
> >
> >> The key thing here is to work out if this is connected to Wayland, or
> >> X.org, or both.
> > If you have a hint on how I can tell the difference I will do it
> > immediately and report. But I'll google a bit more too.
> >
> > Regards, K.
> >
> >
>
> --
> ubuntu-users mailing list
> ubuntu-users at lists.ubuntu.com
> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users