Arch Linux

shadf1g

Member

Registered: 2023-02-25

Posts: 10

KDE Plasma breaks after update

Yesterday I made a pacman -Syyu update, during which some updates for KDE Plasma were being installed. When I booted my system today I was greeted with a black screen after logging in.
I get presented with the login screen like normally, but after logging in I do not see a desktop background or my tool bar. It's just a black screen. All my applications seem to work though, unless I wait for the system to go to sleep. When that happens it doesn't appear to exit sleep mode anymore and I have to reboot to do anything. I also see the same image on both of my screens.
Since I only set up this system recently, I just reinstalled Arch, but the problem persists even after reinstallation.
I use Plasma with xorg and sddm.

I'd appreciate any help.
Thank you in advance.

arojas

Developer

From: Spain

Registered: 2011-10-09

Posts: 2,249

Re: KDE Plasma breaks after update

Are you sure you're using xorg? Plasma 6 changed the default to Wayland, you need to select the X session explicitly

shadf1g

Member

Registered: 2023-02-25

Posts: 10

Re: KDE Plasma breaks after update

Thank you, I didn't see that. I tried changing to wayland now, as I thought it would be less problematic for the future.
This was my first time working with Wayland, so there is a good chance I did it wrong (I was following this guide for the most part: https://www.debugpoint.com/wayland-arch-linux/), but the problem still persists.

caotic

Member

Registered: 2009-09-23

Posts: 11

Re: KDE Plasma breaks after update

Are you sure you're using xorg? Plasma 6 changed the default to Wayland, you need to select the X session explicitly

Where|how can I choose xorg back ?

Nikolai5

Member

From: North West, England, UK

Registered: 2024-01-27

Posts: 257

Re: KDE Plasma breaks after update

Are you using SDDM? If you  have X11 installed you should have a drop-down to select X11 over Wayland.

---

Desktop: Ryzen 7 1800X | AMD 7800XT | KDE Plasma

thommen

Member

From: Poland

Registered: 2017-12-30

Posts: 239

Re: KDE Plasma breaks after update

Disable automatic logging in SDDM. You will have the choice of X11|Wayland when logging in

Last edited by thommen (2024-03-07 16:03:52)

Operative7155

Member

Registered: 2024-03-08

Posts: 1

Re: KDE Plasma breaks after update

Had the same issue as OP... except only with multiple monitors plugged in:
Trying to log in using Wayland with multiple monitors caused the same issue as described above. However, if I unplugged all but one monitor before logging in with Wayland it would work, then after logging in I could plug all my monitors back in and they would work fine.
Logging in with x11 worked in every case.

Anyone have any ideas why Wayland would work with just one monitor plugged in but not multiple?

jeroenvlek

Member

From: The Hague

Registered: 2014-09-16

Posts: 16

Website

Re: KDE Plasma breaks after update

Also having issues after the upgrade. My external monitor on my laptop is not recognized by KDE anymore.

I'm also using SDDM, however, the dropdown in the login screen does not work. It shows Playsma Wayland and if you click on it nothing happens.

(also using Nvidia, the laptop as two cards)

Operating System: Arch Linux
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.8-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × Intel® Core™ i9-10885H CPU @ 2.40GHz
Memory: 62.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics
Manufacturer: LENOVO
Product Name: 20TKCTO1WW
System Version: ThinkPad X1 Extreme Gen 3

Isn't there a config setting I can set to force the use of X?

Last edited by jeroenvlek (2024-03-08 06:52:47)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 24,836

Re: KDE Plasma breaks after update

https://wiki.archlinux.org/title/SDDM#Autologin -- use plasmax11 as the session or more generally: https://wiki.archlinux.org/title/KDE#Starting_Plasma

If you want to test wayland, for the nvidia GPU to be able to display anything you need to enable modesetting: https://wiki.archlinux.org/title/NVIDIA … de_setting

Last edited by V1del (2024-03-08 09:21:16)

jeroenvlek

Member

From: The Hague

Registered: 2014-09-16

Posts: 16

Website

Re: KDE Plasma breaks after update

https://wiki.archlinux.org/title/SDDM#Autologin -- use plasmax11 as the session or more generally: https://wiki.archlinux.org/title/KDE#Starting_Plasma

If you want to test wayland, for the nvidia GPU to be able to display anything you need to enable modesetting: https://wiki.archlinux.org/title/NVIDIA … de_setting

No, I'm fine with sticking to X for now. Is this possible to achieve without autologin? The wiki doesn't seem to mention it and adding startx to my bash_profile just results in an endless loop.

Also interesting btw that /usr/lib/sddm/sddm.conf.d/default.conf contains:

[General]
# Which display server should be used.
# Valid values are: x11, x11-user, wayland. Wayland support is experimental
DisplayServer=x11

So apparently KDE decided to override this and use Wayland.

Last edited by jeroenvlek (2024-03-08 13:44:57)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 24,836

Re: KDE Plasma breaks after update

No this setting is only relevant for SDDM, not for the session you're going to log into. You say you can't select the X Plasma session, why not? The Plasma (Wayland) option in the corner should be relevantly switchable. What's your SDDM theme? Try to use the default/breeze.

jeroenvlek

Member

From: The Hague

Registered: 2014-09-16

Posts: 16

Website

Re: KDE Plasma breaks after update

iI switched from Breeze Dark to normal Breeze and the dropdown still didn't work by clicking or scrolling on it. What did make it switch was selecting it and pressing enter.

Will test the second monitor when I get home, but it seems that I'm now in an X session.

Also lost some keyboard shortcuts (e.g. printscreen opens Spectacle, win +D shows desktop) and my touchpad is enabled again with this upgrade to Plasma 6, maybe an Arch News post is in order?

/edit

Second monitor works

Last edited by jeroenvlek (2024-03-09 09:09:00)