looking for help on multimonitor setup

[Carsten Haitzler]

On Sun, 09 Mar 2025 13:24:59 +0100 Django Reinhard <django013 at gmx.de> said:

> Am Sonntag, 9. März 2025, 13:18:25 CET schrieb Carsten Haitzler:
> > On Sun, 09 Mar 2025 12:40:08 +0100 Django Reinhard <django013 at gmx.de> said:
> > > Am Sonntag, 9. März 2025, 12:33:57 CET schrieb Marco Moock:
> > > > Am 09.03.2025 um 12:32:05 Uhr schrieb Django Reinhard:
> > > > > #!/bin/bash
> > > > > xrandr --setmonitor LEFT   1200/518x1920/324+0+0    DP-2
> > > > > xrandr --setmonitor CENTER 1200/518x1920/324+1200+0 DP-0
> > > > > xrandr --setmonitor RIGHT  1200/518x1920/324+2400+0 DP-5
> > > > > 
> > > > > xrandr --fb 3600x1920
> > > > > xrandr --setmonitor DT 3600/1554x1920/324+0+0 DP-2,DP-0,DP-5
> > > > 
> > > > Have you tried to change the output directly and removing the custom
> > > > xorg.conf?
> > > 
> > > So if you repeat your question, I guess, I don't know what you're talking
> > > about
> > > 
> > > - yes I removed custom xorg.conf
> > > - change output?
> > > 
> > > 	- I executed the commands from above
> > > 
> > > if that's not what you mean, then I don't know how to change output
> > 
> > you do know kde comes with a gui setup panel in its configuration dialogs
> > that will just let you drag screens around and select their modes and also
> > restore it for you on login?
> 
> Sure - but kde has no option for virtual desktop.

what do you mean "virtual desktop". kde would have "virtual desktops" in that
you can switch between them and split your windows between them - x11 wm's have
had this feature for many decades. it's pretty standard.

> I can drag and drop monitors, but they remain 3 different desktops (in my 
> case). 
> ... and rotation is applied AFTER login, so login screen is weird.

that would be a problem with your login manager and configuring it - whatever
your login manager is. in this day and age it'd be expected of your login
manager to set up screens itself (with xrandr protocol on some way).

> I'm looking for a way to get one single desktop, that spans 3 monitors and
> I'd prefer a way that this desktop is available before login (just like
> xinerama does)

is your problem that kde splits the "desktop" screen by screen and each screen
may have its own panels or when you maximize a window or go full-screen it
maximizes/fullscreens on that screen as opposed to spanning all your monitors?

kde will query xrandr for what outputs there are and which regions they look at
and divide things up that way. i think you need to go complain to the kde devs
if you want that changed.

i've had users ask for "one desktop spanning all screens" so when you switch
virtual desktops all screen change and so on and i've said no. not doing it.
there was a time when this happened before wm's and desktops started looking at
all the xinerama and xrandr information and handling it better. those days have
passed i think :)

-- 
------------- Codito, ergo sum - "I code, therefore I am" --------------
Carsten Haitzler - raster at rasterman.com