Been fighting with sddm.conf since updating to plasma 6 on unstable

[MAYBL8]

I have been trying to get this setting to work.

ServerArguments=-nolisten tcp -dpi 225

It seems no matter what sddm.conf file I put it in it has no effect.

I obviously don’t know how this works.
Can someone help me with this please?
I am trying to get the dpi on the sddm screen larger

[Mirdarthos]

So, I might be wrong, but from what I can see the steps are as follows:

1. Backup /etc/sddm.conf:

   sudo mv /etc/sddm.conf /etc/sddm.conf.backup
   

2. Generate a new configuration:

   sddm --example-config | sudo tee /etc/sddm.conf
   

3. In that file, change the value accordingly, on my pc it seems it would be:

   sudo sed --in-place 's/ServerArguments=-nolisten tcp/ServerArguments=-nolisten tcp -dpi 225/1' /etc/sddm.conf
   

4. Reboot and test.

If it doesn’t work or you wish to restore your current config, simply6 reestore the backed-up config file:

sudo rm /etc/sddm.conf
sudo mv /etc/sddm.conf.backup /etc/sddm.conf

And reboot again.

Hope this helps! If not,

Edit:

Although for Wayland, I think that sed command will have to look for and replace a different string:

sudo sed --in-place 's/EnableHiDPI=false/EnableHiDPI=true/1' /etc/sddm.conf

(Or perhaps both if you’ve got X11 as well as Wayland, which is the default for Plasma 6 if I’m correct.)

[cscs]

SDDM has had trouble with applying certain settings, especially DPI, since Plasma 6.
There was a recent Plasma release that was supposed to fix it, but I dont think its in the repos yet.

[medmedin]

Manjaro should configure SDDM to start under Wayland to fix the scaling problem, because scaling on X11 for multi monitors is broken and will never be fixed.

Plus set EnableHiDPI=true both under [X11] and [Wayland] sections in /etc/sddm.conf to fix HiDPI.

https://bugs.kde.org/show_bug.cgi?id=467039

Enable HiDPI scaling by default

KDE is willing to take over SDDM under its wing to integrate it with Plasma, in the last 3 years they have been doing most of the work, but the discussion is not going anywhere with the main maintainer, and KDE didn’t want to create a hostile fork.

But I think they will do it, because Nate Graham started yesterday to list what could be added when SDDM is adopted by KDE.

[cscs]

For some reason the stance so far has been to try and undo things like wayland session by default.
So I might guess that setting wayland by default for SDDM will also be considered a no-go.

But I can confirm that here at least the following works for me
(kwin_wayland being used, hidpi and cursor size appears correct)
/etc/sddm.conf.d/custom.conf

[General]
DisplayServer=wayland
GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=layer-shell

[Wayland]
EnableHiDPI=true
CompositorCommand=kwin_wayland --drm --no-lockscreen --no-global-shortcuts --locale1

Though I also have EnableHiDPI=true in the standard /etc/sddm.conf

[MAYBL8]

I found the setting that works for me and what i wanted to do:

GreeterEnvironment=QT_SCREEN_SCALE_FACTORS=2,QT_FONT_DPI=192