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Old 04-15-2021, 05:27 AM   #1
nrjchimwal
LQ Newbie
 
Registered: Jan 2020
Posts: 6

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SDDM error: changing lockscreen


Hello.

I am using debian with plasma environment.
I am facing an error while changing lockscreen from 'System settings'.

When my laptop gets lock after standby time say (5 minutes). I can't login back to my session because there is no input box for password. All I can see is a wallpaper of my previous lockscreen.

I tried to change the lockscreen but couldn't.

When I try to set defaults or try to remove previously installed lockscreen theme, I get this error :

DBus Backend error: service start org.kde.kcontrol.kcmsddm failed: The permission of the setuid helper is not correct.

I also cannot install new theme. It crashes SDDM.

I posted this thread on reddit and found that there must be a problem with my policykit. But didn't found solution of it.
I tried reinstalling policykit packages but that didn't worked as well.

Please help me out with this
 
Old 04-23-2021, 03:46 PM   #2
camorri
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Registered: Nov 2002
Location: Somewhere inside 9.9 million sq. km. Canada
Distribution: Slackware 14.1, 14.2, current, slackware-arm-currnet
Posts: 5,764

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Quote:
When my laptop gets lock after standby time say (5 minutes). I can't login back to my session because there is no input box for password. All I can see is a wallpaper of my previous lockscreen.
The box for your password is normally not visible until you start to type. So the short answer is, type your password, the box should show up.

Quote:
I tried to change the lockscreen but couldn't.
You need to describe just what you have tried, step by step. Have you gone to 'Screen Locking' ? Provide the error information you see. Normally you start the change as a regular user, and the system will prompt for a root password at the correct time. Is that happening?

It would help if you told us the version and release of Debain you are running. Is it fully updated? KDE plasma has had a lot of updates. SDDM has also had some updates.

Quote:
I also cannot install new theme. It crashes SDDM.
Once again, when do things go wrong? Post errors and how you have tried to install new themes.
 
Old 04-25-2021, 06:09 AM   #3
nrjchimwal
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Registered: Jan 2020
Posts: 6

Original Poster
Rep: Reputation: Disabled
Quote:
The box for your password is normally not visible until you start to type. So the short answer is, type your password, the box should show up.
It won't appear even if enter password or type anything or click anywhere

Quote:
You need to describe just what you have tried, step by step. Have you gone to 'Screen Locking' ? Provide the error information you see. Normally you start the change as a regular user, and the system will prompt for a root password at the correct time. Is that happening?
I went to system settings -> Startup and shutdown -> Login screen (sddm). Now I clicked the bottom left button 'Get new theme' then I tried to install any random theme and got this error : 'sddmthemeinstaller crashed'
Details of this error : Executable: sddmthemeinstaller PID: 9593 Signal: Segmentation fault (11)
And if try to apply default login screen screen (i.e Debian maui), it shows that it is applied but it don't. And if I try to remove currently applied theme I get this error
"DBus Backend error: service start org.kde.kcontrol.kcmsddm failed: The permission of the setuid helper is not correct"

Quote:
It would help if you told us the version and release of Debain you are running. Is it fully updated? KDE plasma has had a lot of updates. SDDM has also had some updates.
I am using Debian 10 buster also I keep my system updated

Quote:
Once again, when do things go wrong? Post errors and how you have tried to install new themes.
I also tried to install theme from console I don't get any error there but the installed theme doesn't show up in system settings
 
Old 04-25-2021, 06:31 AM   #4
camorri
LQ 5k Club
 
Registered: Nov 2002
Location: Somewhere inside 9.9 million sq. km. Canada
Distribution: Slackware 14.1, 14.2, current, slackware-arm-currnet
Posts: 5,764

Rep: Reputation: 705Reputation: 705Reputation: 705Reputation: 705Reputation: 705Reputation: 705Reputation: 705
Thank-you for answering my questions.

I do not run Debain. I have seen these errors before as KDE Plasma 5 was developed. I suspect you have old packages of KDE.

I'm runnig Slackware current ( current is the development branch of Slackeare ) and Plasma here does not have issues you describe. For the record, here are the levels.

Quote:
Operating System: Slackware current
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.10.32
OS Type: 64-bit
Graphics Platform: X11
Processors: 12 AMD Ryzen 5 2600 Six-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: GeForce GT 710/PCIe/SSE2
This could be a QT5 problem or some KDE component problem. Have a look at the levels you have, and see if there are updates. If you are down level, and there are no updates, look to Debain support for more help.

I'm sorry I can not help more.
 
  


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debian, kde, plasma, policykit, sddm


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