Arch Linux

radiobla

Member

Registered: 2020-02-19

Posts: 65

KDE plasma freezes after login with sddm

The KDE Plasma is freezing after login with SDDM. It hangs on "loading" splash screen.

However, I haven't found a good way to extract KDE initialization log.

I recently did the following upgrades (some of them are related to KDE):

[2020-11-22T11:08:54] [ALPM] upgraded apm (2.5.0-4 -> 2.6.0-1)
[2020-11-22T11:08:54] [ALPM] upgraded libx11 (1.6.12-1 -> 1.7.0-1)
[2020-11-22T11:08:54] [ALPM] upgraded ardour (6.3-3 -> 6.4-1)
[2020-11-22T11:08:55] [ALPM] upgraded electron9 (9.3.4-1 -> 9.3.4-2)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-base (5.15.1-3 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-sensors (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-script (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-svg (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-declarative (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-x11extras (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-multimedia (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-speech (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-wayland (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-graphicaleffects (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-quickcontrols (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:55] [ALPM] upgraded qt5-quickcontrols2 (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:56] [ALPM] upgraded kwin (5.20.3-1 -> 5.20.3-2)
[2020-11-22T11:08:56] [ALPM] upgraded lib32-libx11 (1.6.12-1 -> 1.7.0-1)
[2020-11-22T11:08:56] [ALPM] upgraded qt5-location (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:56] [ALPM] upgraded qt5-webchannel (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:56] [ALPM] upgraded qt5-webengine (5.15.1-3 -> 5.15.2-1)
[2020-11-22T11:08:56] [ALPM] upgraded libakonadi (20.08.3-1 -> 20.08.3-2)
[2020-11-22T11:08:56] [ALPM] upgraded libfm-qt (0.16.0-1 -> 0.16.0-2)
[2020-11-22T11:08:56] [ALPM] upgraded libqtxdg (3.6.0-1 -> 3.6.0-2)
[2020-11-22T11:08:56] [ALPM] upgraded python-shiboken2 (5.15.1-2 -> 5.15.2-1)
[2020-11-22T11:08:56] [ALPM] upgraded pyside2 (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:58] [ALPM] upgraded qt5-doc (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:58] [ALPM] upgraded qt5-examples (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:58] [ALPM] upgraded qt5-serialport (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:59] [ALPM] upgraded qt5-tools (5.15.1-2 -> 5.15.2-1)
[2020-11-22T11:08:59] [ALPM] upgraded qt5-webkit (5.212.0alpha4-7 -> 5.212.0alpha4-8)
[2020-11-22T11:08:59] [ALPM] upgraded qt5-websockets (5.15.1-1 -> 5.15.2-1)
[2020-11-22T11:08:59] [ALPM] upgraded qt5-xmlpatterns (5.15.1-1 -> 5.15.2-1)

I also found a xorg-session.log that outputs the following message:

kdeinit5: preparing to launch '/usr/lib/kf5/klauncher'
kdeinit5: Launched KLauncher, pid = 2778, result = 0
kdeinit5: opened connection to :0
kdeinit5: Got SETENV 'GTK_RC_FILES=/etc/gtk/gtkrc:/home/user/.gtkrc:/home/user/.config/gtkrc' from launcher.
kdeinit5: Got SETENV 'GTK2_RC_FILES=/etc/gtk-2.0/gtkrc:/home/user/.gtkrc-2.0:/home/user/.config/gtkrc-2.0' from launcher.
kdeinit5: Got SETENV 'XCURSOR_THEME=Breeze_Snow' from launcher.
kdeinit5: Got SETENV 'XCURSOR_SIZE=48' from launcher.
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kded5 path = /usr/bin pid = 2792
KCrash: Arguments: /usr/bin/kded5 
KCrash: Attempting to start /usr/lib/drkonqi
Unable to start Dr. Konqi
Re-raising signal for core dump handling.

I found no clear error logs on Xorg.*.log.

This is the KDE version info:

$ pacman -Qi plasma-desktop 
Name            : plasma-desktop
Version         : 5.20.3-1
Description     : KDE Plasma Desktop
Architecture    : x86_64
URL             : https://www.kde.org/workspaces/plasmadesktop/
Licenses        : LGPL

Do you guys know what else I could do to investigate this issue?

A full KDE initialization debug log would be welcome, although I think it's some kind of incompatibility between KDE and the new QT packages.

Thank you!

Last edited by radiobla (2020-11-22 23:04:58)

radiobla

Member

Registered: 2020-02-19

Posts: 65

Re: KDE plasma freezes after login with sddm

I found another strange behavior:

I'm currently using Cinnamon, since KDE is not initializing. Then I tried to start a random Qt application (kcalc) and it says:

$ kcalc
Cannot mix incompatible Qt library (5.15.1) with this library (5.15.2)
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kcalc path = /usr/bin pid = 4313
KCrash: Arguments: /usr/bin/kcalc 
KCrash: Attempting to start /usr/lib/drkonqi
Cannot mix incompatible Qt library (5.15.1) with this library (5.15.2)
Unable to start Dr. Konqi
Re-raising signal for core dump handling.
Aborted (core dumped)

Cannot mix incompatible Qt library (5.15.1) with this library (5.15.2)

It seems I'm gonna have to downgrade to Qt 5.15.1.

Last edited by radiobla (2020-11-22 22:46:33)

radiobla

Member

Registered: 2020-02-19

Posts: 65

Re: KDE plasma freezes after login with sddm

Downgrading qt5-base to 5.15.1 doesn't help.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,885

Re: KDE plasma freezes after login with sddm

you need to rebuild out of repo qt themes against the new qt version.

Last edited by V1del (2020-11-22 23:14:27)

radiobla

Member

Registered: 2020-02-19

Posts: 65

Re: KDE plasma freezes after login with sddm

V1del,

Got it. Is there anyway to list all the themes installed out of repo?

I've just downgraded the following packages:

qt5-base-5.15.1-3-x86_64.pkg.tar.zst
qt5-declarative-5.15.1-1-x86_64.pkg.tar.zst
qt5-doc-5.15.1-1-x86_64.pkg.tar.zst
qt5-examples-5.15.1-1-x86_64.pkg.tar.zst
qt5-graphicaleffects-5.15.1-1-x86_64.pkg.tar.zst
qt5-location-5.15.1-1-x86_64.pkg.tar.zst
qt5-multimedia-5.15.1-1-x86_64.pkg.tar.zst
qt5-quickcontrols2-5.15.1-1-x86_64.pkg.tar.zst
qt5-quickcontrols-5.15.1-1-x86_64.pkg.tar.zst
qt5-script-5.15.1-1-x86_64.pkg.tar.zst
qt5-sensors-5.15.1-1-x86_64.pkg.tar.zst
qt5-serialport-5.15.1-1-x86_64.pkg.tar.zst
qt5-speech-5.15.1-1-x86_64.pkg.tar.zst
qt5-svg-5.15.1-1-x86_64.pkg.tar.zst
qt5-tools-5.15.1-2-x86_64.pkg.tar.zst
qt5-wayland-5.15.1-1-x86_64.pkg.tar.zst
qt5-webchannel-5.15.1-1-x86_64.pkg.tar.zst
qt5-webengine-5.15.1-3-x86_64.pkg.tar.zst
qt5-webkit-5.212.0alpha4-7-x86_64.pkg.tar.zst
qt5-websockets-5.15.1-1-x86_64.pkg.tar.zst
qt5-x11extras-5.15.1-1-x86_64.pkg.tar.zst
qt5-xmlpatterns-5.15.1-1-x86_64.pkg.tar.zst

It worked, but didn't solve the issue. As soon as I upgrade, it could stop working or require manual intervention.

Last edited by radiobla (2020-11-23 00:02:16)

radiobla

Member

Registered: 2020-02-19

Posts: 65

Re: KDE plasma freezes after login with sddm

Actually, I'd like to remove all the themes installed out of arch repo.

Vanilla themes are great for me. I'm using plain Breeze Dark though.

Last edited by radiobla (2020-11-23 00:07:52)

radiobla

Member

Registered: 2020-02-19

Posts: 65

Re: KDE plasma freezes after login with sddm

I just found out I had a qt5-stylesplugin package installed from AUR.

I used "pacman -Qm" to list them.

Thank you, V1del!

Should I mark the issue as solved or do you do that?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,885

Re: KDE plasma freezes after login with sddm

You should do that, by editing the first post and amending the title.