second monitor suddenly not detected

[R C]

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.







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.
>
>