Bug 433648

Summary:	sddm configuration should provide an option to mirror the screens on multi-monitor setups instead of extending it
Product:	[Applications] systemsettings	Reporter:	krzmbrzl
Component:	kcm_sddm	Assignee:	David Edmundson <kde>
Status:	CONFIRMED ---
Severity:	wishlist	CC:	kde, nate, plasma-bugs, postix, till2.schaefer
Priority:	NOR
Version:	5.22.3
Target Milestone:	---
Platform:	Other
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=453984
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description krzmbrzl 2021-02-26 10:11:27 UTC

SUMMARY
When having the login screen that is prompting for a password, there are 2 independent login screens rendered on each connected monitor (if usually the mode is set to extend the monitor instead of mirroring the main screen at least).
For a login screen I think this is a rather weird behavior as this forces be to figure out which of the password prompts is currently having focus.
Thus I would propose to mirror the main screen's content to all secondary screens for the login prompt and only start extending the screen after that.

STEPS TO REPRODUCE
1. Configure multiple monitors to extend the screen
2. Open login prompt (aka: logout)


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.21
KDE Plasma Version: 5.21.1
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-59-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4770 CPU @ 3.40GHz
Memory: 15,6 GiB of RAM
Graphics Processor: GeForce GTX 660 Ti/PCIe/SSE2

Comment 1 Till Schäfer 2021-07-22 10:18:44 UTC

Do you mean the screen locker or the the display manager? the display manager may not apply to plasmashell (is SDDM). SDDM at my setup only has a single screen for login. 

However, I find this really relevant for the lock screen.

Comment 2 Till Schäfer 2021-07-22 10:19:24 UTC

possibly related to Bug 440144

Comment 3 krzmbrzl 2021-07-24 10:41:24 UTC

> Do you mean the screen locker or the the display manager?

I'm not sure - maybe neither. I am referring to the screen you land on when you just booted your computer and are then prompted to enter your password to log-in

Comment 4 Till Schäfer 2021-07-25 20:32:09 UTC

ok, you are talking about the display manager (most likely sddm) in this case. 

You can setup sddm using xrandr, see here: https://blog.victormendonca.com/2018/06/29/how-to-fix-sddm-on-multiple-screens/

The instructions there do not fully cover your setting, but ist should be fairly simple to use xrandr to mirror the screen.

I am re-assingning this bug to the sddm kcm (i.e., the system settings module to configure it). Maybe it is a common use case they can support in their setup.

Comment 5 postix 2022-05-18 13:28:26 UTC


*** This bug has been marked as a duplicate of bug 390503 ***