Ubuntu 20.4.6 LTS Nvidia legacy 340 driver and external monitor

[Sorin Srbu]

On Mon, 2024-08-26 at 12:58 +0100, Richmond via ubuntu-users wrote:
> Sorin Srbu via ubuntu-users wrote:
> > On Sun, 2024-08-25 at 00:07 +0100, Richmond via ubuntu-users wrote:
> > > Liam Proven wrote:
> > > > On Sat, 24 Aug 2024 at 20:21, Richmond via ubuntu-users
> > > > <ubuntu-users at lists.ubuntu.com> wrote:
> > > > > when gdm3 starts up the graphics card is reset to its default
> > > > > settings, which are not quite right. I tried to change these
> > > > > settings in the gnome preferences - displays, but it doesn't
> > > > > quite work the same and sets the virtual screen bigger than
> > > > > the screen. 
> > > > Are you using GNOME on Wayland or on X.org?
> > > > 
> > > > Settings in `/etc/X11/xorg.conf` won't affect Wayland.
> > > > 
> > > > 
> > > I would ask how to tell, but if xorg.conf doesn't affect Wayland,
> > > then I must be using xorg, because it clearly works until gdm or
> > > gnome resets the card.
> > > 
> > > I think on Debian there was an option on the login screen to
> > > choose between Wayland and Xorg, but I don't see that with Ubuntu.
> > > 
> > > 
> > Hello!
> > 
> > What's the output from the below command in a terminal?
> > 
> > echo $XDG_SESSION_TYPE
> > 
> > 
> > Just making sure we're on the same track. :-)
> Hi,
> 
> The output is:
> 
> x11
> 
> According to the ever dependable chatgpt, this variable is set by the
> display manager. So x11 is what I would expect as I currently have the
> display manager set to xdm. Then, depending on which user I log in as,
> either the window manager ctwm is called from .xsession, or the
> default
> gnome desktop is started if there is no .xsession file.
> 
> So the case I am considering is the latter where no .xsession file
> exists and I am using the default desktop environment, gnome.
> 
> This gave me an idea to check /etc/gdm3/config and set
> WaylandEnable=false the dpkg-reconfigure gdm3 but the display was
> still
> not set correctly so I changed the display manager back to xdm.

Ok, thanks.

But isn't gdm3 the default with Gnome?
Why is xdm being used, or is this a recent change with Ubuntu?

Anyway, when I've had weirdish graphic problems I've used xrandr to
hard-set resolutions, screen setups etc. Those setting are remembered
between reboots and logoffs in my experience.

Would that maybe be of help for you too?


-- 
//Sorin Srbu, Serverdrift
Tele: 08-524 84166
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