Bug 511934 - Qt6-base 6.10.0-3 breaks SDDM.
Summary: Qt6-base 6.10.0-3 breaks SDDM.
Status: RESOLVED DOWNSTREAM
Alias: None
Product: kde
Classification: I don't know
Component: general (other bugs)
Version First Reported In: unspecified
Platform: EndeavourOS Linux
: NOR major
Target Milestone: ---
Assignee: Unassigned bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-11-10 21:30 UTC by Shariar Rahman
Modified: 2025-11-11 03:10 UTC (History)
1 user (show)

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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