second monitor suddenly not detected

[Charles M]

Karl this is late and doesn't look like it's relevant, but I had the
same issue with my 2nd DVI connected monitor the other day. In my case
I think I accidentally removed the nvidia driver. When my display came
back up, the single display was not 1920x1080. It happened after
rebooting from my Windows 10 partition to Xubuntu.

I have a habit sometimes of typing:

sudo apt autoremove

I've done this quite a bit in the past because I've worked on servers
where they kept so many kernels it ended up filling the machine. In my
case I re-added the NVidia driver (drivers) through the UI, rebooted
and all was well. I noticed today a number of nvidia drivers again
marked to be removed, including the display driver. I'm not typing
sudo apt autoremove this time...

Charles

On Sat, Sep 26, 2020 at 4:49 AM Karl Auer <kauer at biplane.com.au> wrote:
>
> This is a new one on me. For no apparent reason, the display manager
> (Wayland/Ubuntu on 20.04) exited. I still had a console, so I logged in
> and powered off the laptop gracefully.
>
> Upon powering up, Ubuntu did not detect my second HDMI-connected
> monitor. There are a couple of other niggles, such as a Gnome shell
> extension having vanished. And the gnome tweaks tool doesn't show 90%
> of the tweaks it used to. Butthe display looks OK otherwise.
>
> I've looked for answers in google, but the answers don't seem to apply
> (and are almost all regarding 18.04). I tried switching from Ubuntu to
> Gnome and back at login, no change. Tried update/upgrade and it
> upgraded a surprising number of packages in icluding Nvidia libraries
> and suchlike, but no change. Ran "sudo dpkg-reconfigure gdm3", no
> output and no change.
>
> Short of re-installing Ubuntu, is it possible to reinstall or
> reconfigure the graphics subsystem? This is a Lenovo Y540 with Nvidia
> graphics hardware, and currently the nouveau driver is active.
>
> Regards, K.
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Karl Auer (kauer at biplane.com.au)
> http://www.biplane.com.au/kauer
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-- 
Charles
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