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Endless authentication loop (sddm)

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pstickar
Tux's lil' helper
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Endless authentication loop (sddm)

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Post by pstickar » Fri Feb 20, 2026 8:20 pm

Hello

since the latest system update I cannot start plasma. I get to the sddm authentication screen, my password is accepted, and a few seconds later I'm asked the pasword again. This goes endless.

I can switch to a tty terminal, where I can login without problems. If I run startx, I get to a GUI like system, but it is not plasma.

I did yet another system update, but it doesn't help.

What can I try?

Thanks in advance!

Regards,
Pablo
p.
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sam_
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Post by sam_ » Fri Feb 20, 2026 8:33 pm

That may be Plasma (kwin probably or plasma-workspace) crashing rather than an authentication problem. Is this OpenRC or systemd? Could you try digging for some logs?
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pstickar
Tux's lil' helper
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Joined: Sun Nov 26, 2006 11:22 am
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Post by pstickar » Fri Feb 20, 2026 8:41 pm

It is OpenRC.

I will search for logs. I'm not acustomed to have trouble, so I do not know where to look.

Best,
Pablo
p.
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pstickar
Tux's lil' helper
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Posts: 118
Joined: Sun Nov 26, 2006 11:22 am
Location: Germany

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Post by pstickar » Fri Feb 20, 2026 8:50 pm

I found a log file of SDDM (/var/log/sddm.log):

https://bpa.st/2IYA
p.
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szatox
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Post by szatox » Fri Feb 20, 2026 8:53 pm

I just had something similar, the window manager was crashing due to "missing private symbol" in some library. Had to recompile it to make them speak the same language again.

Found it out by trying to start my DE from terminal instead of going through display-manager, which allowed me to actually see the errors.
Make Pipewire a system service
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pstickar
Tux's lil' helper
Tux's lil' helper
Posts: 118
Joined: Sun Nov 26, 2006 11:22 am
Location: Germany

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Post by pstickar » Fri Feb 20, 2026 9:01 pm

I found errors in the log file /var/log/Xorg.0.log:

https://bpa.st/QENQ

EDIT
I'm confused, because, after a reboot, the errors are gone (https://bpa.st/TGYQ). But plasma does not start.
p.
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eccerr0r
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Post by eccerr0r » Sat Feb 21, 2026 3:57 am

I see wayland and X stuff... Which were you planning to use?
Intel Core i7 2700K/Radeon Firepro W2100/24GB DDR3/800GB SSD
What am I supposed watching?
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pstickar
Tux's lil' helper
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Posts: 118
Joined: Sun Nov 26, 2006 11:22 am
Location: Germany

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Post by pstickar » Sat Feb 21, 2026 10:04 am

eccerr0r wrote:I see wayland and X stuff... Which were you planning to use?
I want to continue using kde-plasma. I assumed, probably wrong, that X is the underlying layer.

Could you please help me finding the relevant log files? Or how to generate them? Thanks in advance.

Best regards,
Pablo
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Josef.95
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Post by Josef.95 » Sat Feb 21, 2026 10:37 am

Hm, works it without the old x11-drivers/xf86-video-intel driver?
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pstickar
Tux's lil' helper
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Posts: 118
Joined: Sun Nov 26, 2006 11:22 am
Location: Germany

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Post by pstickar » Sat Feb 21, 2026 11:52 am

The latest system update solved the problem.
It included an update of kwin and of plasma-workspace.

Best regards,
Pablo
p.
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