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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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On a dual monitor setup, how to set which display is the default for the Logon prompt in SDDM ? (lemmy.ml)

submitted 1 month ago by mub@lemmy.ml to c/linux@lemmy.ml

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I'm using EndeavourOS (Arch btw) with KDE plasma 6.x (Wayland), SDDM, and systemd as boot manager. I have 2 displays, one HDMI-A-1 (1080p) and one on DP-1 (Ultrawide).

When I boot the password entry cursor defaults to the HDMI display, but I want it to default to the DP-1 display.

I've tried a few things, mostly suggestions from ChatGPT. But nothing has worked. The weird thing is at boot the boot menu and boot messages all appear on DP-1, and it is set as primary in KDE and that works fine as well. It is just the logon prompt that defaults to the wrong display.

Things I've tried so far.

Adding video=DP-1:e to the options in the systemd entry - (No effect)
Edited /etc/sddm.conf.d/wayland.conf to run a script that did the following: kwriteconfig6 --file startkderc --group General --key PrimaryScreen DP-1 (didn't fix it, actually broke the logon process so had to remove it)

I'm just not familiar enough with how SDDM works so hoping for some good pointers to provide the answer or point me in the right direction.

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[–] bjoern_tantau@swg-empire.de 0 points 1 month ago

SDDM seems to be severely underdeveloped. It doesn't seem to get nearly as much love as the rest of KDE. You might consider switching to GDM or another display manager that does what you want. You can be happy that your HDMI monitor is not mirrored smaller on your ultrawide.