Bug 512576

Summary: SDDM requires the ENTER key twice when resuming on the dual monitor system
Product: [Plasma] plasmashell Reporter: HORIE Seiichi <a6m1zero+kde>
Component: Screen lockingAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: kdedev, nate
Priority: NOR Keywords: multiscreen
Version First Reported In: 6.5.1   
Target Milestone: 1.0   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: During the password input. Just before the first ENTER key.
Just after typing the first ENTER. You can see both monitors show password field.

Description HORIE Seiichi 2025-11-25 01:08:34 UTC
Created attachment 187137 [details]
During the password input. Just before the first ENTER key.

SUMMARY
KDDM requires the ENTER key twice when resuming with a dual monitor. 

STEPS TO REPRODUCE
1. Connect the external monitor.
2. Sleep the system.
3. Resume the system.

OBSERVED RESULT
At first, the typed password is shown only for one of the monitors. After typing the Enter key, the other monitor shows the password. 

And then, secondly, typing the ENTER key let the customer log in. 

EXPECTED RESULT
By the first ENTER key, the system should let the user log in. 

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Kubuntu 25.10 with KDE Plasma 6.5 backport.
KDE Plasma Version:  6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2

ADDITIONAL INFORMATION
Not only Kubuntu but also KDE Linux has this behavior.
Comment 1 HORIE Seiichi 2025-11-25 01:10:12 UTC
Created attachment 187138 [details]
Just after typing the first ENTER. You can see both monitors show password field.
Comment 2 HORIE Seiichi 2025-11-25 01:12:03 UTC
I think this is a KDDM issue, but I don't know how to set the Product to the 'KDDM' category.
Comment 3 HORIE Seiichi 2025-11-25 02:05:58 UTC
Here is the information on the KDE Linux that reproduces this problem. 

KDE Linux 2025-11-23
KDE Plasma Version:  6.5.80
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.0
Kernel version 6.17.8-arch1-1
Graphis Platform: Wayland.
Comment 4 Antonio Rojas 2025-11-25 07:34:43 UTC
(In reply to HORIE Seiichi from comment #2)
> I think this is a KDDM issue, but I don't know how to set the Product to the
> 'KDDM' category.

There is no such thing as 'KDDM'
Comment 5 Nate Graham 2025-12-09 23:01:45 UTC

*** This bug has been marked as a duplicate of bug 511687 ***
Comment 6 Nate Graham 2025-12-10 16:06:21 UTC

*** This bug has been marked as a duplicate of bug 512028 ***