Questions tagged [sddm]

QML based X11 and Wayland display manager

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How can I fix screen tearing and flickering issues with KDE Plasma and SDDM after switching from GNOME on Ubuntu 22.04?

I’m using a 2012 MacBook Air with an Intel i7-3667U processor and no dedicated GPU. I just reconfigured SDDM and went to use KDE, but I noticed that SDDM flickered white rapidly whenever at the login ...
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Debian login on power up

How can I avoid this, and immediately boot into Lubuntu?
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sddm-greeter cpu usage, lxqt

I've got an annoying issue that I am trying to troubleshoot and could use some help! I have 10 lxqt VM's managed via proxmox on a rather old machine. The OS needs to be very light and low on resource ...
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X server not starting

Today, when I turned on my PC and logged in, plasma was not starting, so I decided to hit Ctrl+Alt+F2 to change to a terminal. Then I executed startx but it wasn't providing output. Then I tried to ...
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Boot hangs after sddm removal

I recently installed sddm, but after trying and not liking it decided to uninstall it. However, on a restart, the system hangs before getting to a login screen. I can't access anything in the system ...
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I need to add Numlock=on in the [General] section of sddm configuration on Ubuntu Focal, where is sddm.conf?

I need to add Numlock=on in the [General] section of the sddm configuration, but I cannot find it : $ man sddm.conf | grep -1 sddm.conf NAME sddm.conf - sddm display manager configuration -- ...
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Active Directory SSSD - Change Password on GDM login Screen

Looking to see if I can expand the capabilities of the SSSD/AD system with GDM, or SDDM. We want users to be able to change their Active Directory password through our Ubuntu machines, if their ...
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No display when starting an additional X session

So I have this setup at home: +------------------+ +----------------+ | Secondary screen | | Primary screen | | 1280x1024 75Hz | | 1920x1200 60Hz | | (Rotated) | | | +--+---...
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Display manager SDDM doesn't make use of 3rd monitor

I have computer with 2 videocards and 3 monitors attached - 2 to one card and 1 to another one. I run Ubuntu Server with X and I want to use most lightweight display manager as possible. I’m trying to ...
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Login Screen gets stuck after entering password on Kubuntu

On Kubuntu here. When I enter my password on the login screen and press enter, all the buttons slightly fade and the screen just gets stuck with only the mouse cursor really being able to move. ...
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SDDM low fps on boot

I am currently having a small issue with the FPS on my SDDM login being around 30 fps. The screen goes back to 100 FPS the moment I am logged in or if I select another user and the login screen has ...
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Login Greeter takes 20~30 sec (after bootup apparently finished) to appear

I looked into this question among a few others (on and off SO) for a solution. The upvoted (but not accepted) answer to that question, suggests entropy might be a problem. I have infact from the ...
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472 views

unable to kill user-session with loginctl

I'm running lubuntu 20.04 with sddm as display-manager. Whenever I logout over gui and login as a different user the user-session is not be killed (do not know if it is by-design). So loginctl shows ...
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Switch user in Kubuntu gives black screen

I've had trouble with switch user for the last 2 years at least. For a long time the option was gone because of some deep regression. Now that it's back, it doesn't work. Activating 'Switch user' ...
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I'm having a black screen before login screen on kubuntu

My kubuntu has been giving me problems for the past few days. It was first showing a black screen with a cursor on the screen and I then stopped and started the sddm service and the login GUI came ...
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KDE with Ubuntu 20.04

I have installed kde on my Ubuntu installation trough sudo apt install kde-full, but I still have some question about updates, is there any issue removing Ubuntu desktop from it using sudo apt remove ...
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systemd --user children processes not stopped afer logout

After each logout from KDE, I can find the systemd --user process when I log into a tty{2..6} console and its remaining 23 children still running : $ ps -Af | grep -v grep | egrep -w "PPID|$(...
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Kubuntu 21.04 in VMware: SDDM will not start X server. startx works fine as user to bring up Plasma

The title says it, basically. Did a fresh install of Kubuntu into a VMware Workstation VM. Upon booting the VM, the text console on tty1 remains, and the login manager never starts. I'm able to switch ...
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I'm getting OEM logo after kubuntu logo on boot

I'm able to boot into the command line, but when I try to log into kde desktop I see kubuntu logo and the it goes away and the OEM logo appears and gets stuck. I have no clue what could be the issue I ...
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2 answers
173 views

How to highlight password field by default in SDDM (Lubuntu)?

I have installed Lubuntu 21.04. The sddm login page had the password field selected by default but after the update that's not the case. I have to manually select password field before typing it. Is ...
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564 views

How to enable trackpad tap to click in SDDM login page?

I'm using Lubuntu 21.04. I would like to enable tap to click in the SDDM login screen. Is there a way to enable it?
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531 views

Unable to login !!! "Enter" key not working?

Ok hi there,I have been using Ubuntu Gnome 20.04 and I have insalled the KDE plasma environment on Ubuntu from help of the reference taken from You tube.Now after it had installed and restarts I get ...
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2k views

Use Wayland session with Lubuntu 21.04 on Raspberry Pi 4B

I'm on a quest to find the best possible configuration for our Raspberry Pi 4B used almost exclusively to watch internet video streams. So far, I've tried getting the most out of Raspbian/Raspberry Pi ...
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1 answer
772 views

Kubuntu 20.04 keeps perform black screen with NVIDIA

I have been trying Ubuntu 20.04 for two weeks. It worked well with NVIDIA graphic card. Then I tried to install Plasma Desktop. If I choose "gdm3" on installation, everything goes well. ...
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Custom install with ZFS Root for Neon (newer Plasma w/20.04 base), SDDM not starting up

So following these instructions to install Ubuntu 20.04 onto ZFS Root, I got KDE Neon installed (neon-desktop virtual package). Everything seems good, except when I boot up there's no GUI login. I ...
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LUbuntu 20.04 and tmporary user like guest?

How can I enable a restricted user where everything is reset after logout? Note: User is used for web-browsing so security is definitely a topic for me. In case user accesses maicious sites everything ...
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Kubuntu 20.04 lost sddm display

I've avoided posting this question for a month while I tried to find out on my own what had gone wrong, but now there is no other recourse. After running Kubuntu 20.04 for about a year on a desktop (...
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1 vote
1 answer
87 views

Bash script not running when I boot my laptop

I am new to Linux and I've set it up just how I want it. However, when I am using my laptop at home, login screen appears on both laptop and external screen. I want it to appear just on my external ...
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1 vote
1 answer
615 views

Lubuntu 20_04 GUI does not start, only terminal

Lubuntu 20 04 boots either in a "text mode" and says [ok] for Finished hold until boot process finishes up Started OpenBSD Secure Shell Server Finished Terminate Plymouth Boot Screen Or it ...
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1 answer
2k views

Can not login to SDDM using fingerprint on Kubuntu 20.10

Recently I've bought Lenovo ThinkPad X1 Carbon Gen8. Everything seems fine except one thing - I can't fully configure fingerprint reader. I've followed guide https://askubuntu.com/a/1082465/249099 and ...
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1 answer
532 views

Remembering Screen Brightness at Display Manager/Startup

With using linux on and off on different PC's through the years, one issue I have not been able to solve is the brightness setting during boot sitting at the Display Manager. I am running KDE version ...
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7 votes
3 answers
2k views

No more 'switch user' from sddm

I've searched extensively and there are many mentions of this problem but it seems only a few disparate users have had it over the last few months. But the 3 Kubuntu systems I upgraded to 20.10 all ...
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KDE Plasma login service failed - login loop in SDDM

When I log in to my laptop with Kubuntu 20.10, I enter the password and wait for the desktop window to load but it does not show and it returns me to the initial login window. I ran the test several ...
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System will not boot after sudo update and upgrade on 20.04 kubuntu

I am using kubuntu and used ubuntu studio add-on to get low latency kernel. After doing a sudo update and upgrade, the system stopped booting to the login screen. I am able to switch to tty2 and login ...
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3 votes
1 answer
790 views

What is the difference between GNOME desktop and Ubuntu in SDDM?

I installed Kubuntu on my machine, and then decided to try the regular GNOME desktop. Thus I installed ubuntu-gnome-desktop and logged in from the welcome screen running SDDM. This has been a ...
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3 answers
4k views

sddm blocks screen with on-screen keyboard in Ubuntu 20.04

I have recently installed KDE 5 (kde-plasma-desktop) on Ubuntu 20.04, and as part of the installation, it asked me to switch the login screen manager to sddm. When sddm starts (either on boot, or ...
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607 views

Sddm login screen blank but active

I'm using KDE plasma with lightdm. I can boot my laptop without any problems. However, I can't change my login screen this way. So, my question is: Why am I getting a black screen at the login if I ...
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2k views

How to change SDDM login screen after sleep?

I tried looking at this question but it doesn't address my problem: How to change login screen sddm on KDE Plasma 5 I'm able to install new SDDM login screens (I'm using Kubuntu 20.04) using the ...
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Java Shutdown hooks on Lubuntu 20.04

I am using the following systemd service to shutdown a Java program gracefully when shutting down a PC running Lubuntu 20.04.1. The script in /usr/local/bin/pre-shutdown searches for all running Java ...
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390 views

Failed to start lightdm (stuck on bootloop)

Currently I was using kde on ubuntu. But after trying to install cinnamon and lightdm, I can't start my OS. It is stucked on boot logo. And it's showing, "failed to start lightdm". I tried ...
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11 votes
3 answers
3k views

How do I set a picture for my user on the login screen in Lubuntu 20.04?

I would like to display an image of my choice instead of the grey icon above my username on the login screen: No doubt there is a setting for this somewhere, but I have failed to find it so far. How ...
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3 votes
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606 views

KDE login screen of wrong monitor

I have Kubuntu 20.04 LTS version. I have two monitors connected to my PC - primary one via HDMI and secondary via DisplayPort. Both have the same resolution. When I get the KDE login screen (sddm i ...
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1 answer
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Every time restart Lubuntu terminal unable to init server, cannot open display

I did something related to ssh or display setting which I don't understand, now every time I restart the Lubuntu, terminal cannot open graphical application: chen@jesuslovesme:~$ gedit Unable to init ...
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1 vote
1 answer
219 views

How to color manage sddm login screen?

I'm using Kubuntu with sddm login screen. Currently, the monitor icc profile loads after login. I've tried "Install System Wide" in the colord system setting, but that appears to only make the profile ...
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sddm-greeter ignores HideUsers in /etc/sddm.conf

I'm using lubuntu disco with displaymanager sddm cat /etc/X11/default-display-manager /usr/bin/sddm On my system are 2 users the main one and a test account. I'll try to hide the test user in sddm. ...
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270 views

Sddm error multiple screens

login screen gets overlapped like in the image setup I've tried to put these lines in the /usr/share/sddm/scripts/Xsetup file but it doesn't work xrandr --output eDP-1-1 --mode 1920x1080 --pos 0x0 -...
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sddm.conf and HaltCommand

I'm using Kubuntu 19.10. My goal is to power off the system only if rsnapshot is not running. So I need to setup up my own poweroff command and the first idea was to use sddm.conf file, HaltCommand=...
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663 views

Change login user for SDDM under LUbuntu 18.04

SDDM is a modern display manager for X11 aiming to be fast, simple and beautiful. It uses modern technologies like QtQuick to create smooth, animated user interfaces. However, my SDDM login ...
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914 views

How to have persistent session settings in SDDM for each user?

I use SDDM as session manager in Lubuntu 19.04. By default I got two desktops: Lubuntu and LXQt. I have two users. Each one uses a different desktop session. However, every time I switch users, the ...
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SDDM cannot display "Password expired. You must change it now"

I have ubuntu 18.04 with KDE 5 installed, using SDDM. I try to setup new user account on Kerberos and set the inital password expired, hence forced users to change password on the first login. The ...
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