second monitor suddenly not detected

[Liam Proven]

On Sun, 27 Sep 2020 at 01:46, Karl Auer <kauer at biplane.com.au> wrote:
>
> I did a graceful power-off from a console.

Yes, I know, I read that. I am just trying to be helpful and point out
a fast easy way that works even if you can't log in or see the
console.
>
> That's my guess, and why I was hoping someone could tell me how to re-
> install the graphics layers. I mean  - it happens when installing the
> OS for the first time, surely it is possible to repeat the process?

Depends -- some things get written, rather than copied into place.

Create a new account; see if it is affected?

> But the request for info on how to do that has been consistently
> ignored, leading me to think it isn't possible. Google doesn't help
> either.

Doesn't it? I found this very quickly:

https://askubuntu.com/questions/67764/how-to-remove-and-reinstall-gnome-3

> All already done. No change. The miminal data returned by e.g. xrandr
> suggests a driver issue to me, but see above - how do I re-install
> them? Remember everything was working perfectly until the GUI crashed.

Have you checked your disk for errors with `fsck`?

> > So does that mean switching from Wayland to X.org?
>
> 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!

I *think* from the last time I tried it, a year or 2 back maybe, that
there were options for:

• Ubuntu-customised GNOME on Wayland
• Ubuntu-customised GNOME on X.org
• Plain vanilla GNOME on Wayland
• Plain vanilla GNOME on X.org

The key thing here is to work out if this is connected to Wayland, or
X.org, or both.


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