Bug 511934

Summary:	Qt6-base 6.10.0-3 breaks SDDM.
Product:	[I don't know] kde	Reporter:	Shariar Rahman <srahman53171618>
Component:	general	Assignee:	Unassigned bugs <unassigned-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	major	CC:	arojas
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	EndeavourOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Shariar Rahman 2025-11-10 21:30:53 UTC

SUMMARY
Updated Qt6-base from 6.10.0-2 to 6.10.0-3. SDDM would not load. Stuck on loading screen right before GUI. Was able to switch to new tty. Downgraded back to 6.10.0-2. Loaded back in normally.

Error messages mentioned below.

Sddm theme is eos-breeze. EndeavorOS. 6.12 LTS. Switching to 6.17 does not fix issue. 

STEPS TO REPRODUCE
1. In EndeavorOS / Arch upgrade to qt6-base 6.10.0-3 with eos-breeze sddm theme (might work for other themes too. Didn't try. eos-breeze isn't too different from breeze as far as I know)
2. Reboot

OBSERVED RESULT
SDDM does not load. Stuck on loading screen right before GUI. Display resolution/scaling changes as the last step (as is normal). Monitor is 1440p and usually this scaling change happens normally and then SDDM loads up. With qt6-base 6.10.0-3 the scaling change happens and terminal startup messages load back up.

Systemd error message: 
"Failed to start Simple Desktop Display Manager

A start job for unit sddm.service has finished with a failure."

EXPECTED RESULT
Load into SDDM

SOFTWARE/OS VERSIONS
Operating System: EndeavourOS 
KDE Plasma Version: 6.5.2
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.12.57-1.1-lts (64-bit)
Graphics Platform: Wayland

Comment 1 Antonio Rojas 2025-11-10 21:37:13 UTC

Please report this to your distribution

Comment 2 Shariar Rahman 2025-11-10 21:44:32 UTC

(In reply to Antonio Rojas from comment #1)
> Please report this to your distribution

reported https://forum.endeavouros.com/t/qt6-base-6-10-0-3-breaks-sddm-system-appears-to-hang/76302. Apologies if this the wrong place to report. Under the impression that the error is with qt6-base. Not the theme.

Comment 3 Shariar Rahman 2025-11-10 21:52:29 UTC

(In reply to Antonio Rojas from comment #1)
> Please report this to your distribution

Same error observed with default breeze theme.

Comment 4 Antonio Rojas 2025-11-10 21:57:34 UTC

(In reply to Shariar Rahman from comment #3)
> (In reply to Antonio Rojas from comment #1)
> > Please report this to your distribution
> 
> Same error observed with default breeze theme.

Still not a KDE problem, if this is triggered by a package update in your distribution. Please follow up in your downstream thread.

Comment 5 Shariar Rahman 2025-11-11 03:10:01 UTC

(In reply to Antonio Rojas from comment #4)
> (In reply to Shariar Rahman from comment #3)
> > (In reply to Antonio Rojas from comment #1)
> > > Please report this to your distribution
> > 
> > Same error observed with default breeze theme.
> 
> Still not a KDE problem, if this is triggered by a package update in your
> distribution. Please follow up in your downstream thread.

Thanks for the help. It was an ALHP issue and has since been resolved