Bug 515203 - Disable the left one of two monitors results in " Position of output %s is negative"
Summary: Disable the left one of two monitors results in " Position of output %s is ne...
Status: REPORTED
Alias: None
Product: systemsettings
Classification: Applications
Component: kcm_kscreen (other bugs)
Version First Reported In: 6.5.91
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: kscreen-bugs-null@kde.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-28 14:10 UTC by Ye Jingchen
Modified: 2026-01-30 13:48 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
Error message in Display Configuration (38.79 KB, image/webp)
2026-01-28 14:10 UTC, Ye Jingchen 		Details
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Description Ye Jingchen 2026-01-28 14:10:34 UTC 
Created attachment 188989 [details]
Error message in Display Configuration

SUMMARY
(Using KDE Plasma 6.6 Beta 2 from Arch Linux [kde-unstable])

I have two monitors arranged horizontal in System Settings. When I try to disable the left one in Display Configuration, it refused to do so with an error message:

> Couldn’t apply display configuration: Position of output %s is negative, that is not supported(I18N_EXCESS_ARGUMENTS_SUPPLIED)

Disabling the right side monitor works without problem. Whether the left or right monitor is the Primary does not seem to matter, both will trigger the issue. Using Meta+P to enable only one monitor (can be any of the two) also works.

Probably related to https://bugs.kde.org/show_bug.cgi?id=514732, but here the error message contains a literal '%s' instead of some monitor or connector name.

STEPS TO REPRODUCE
1. Have two monitors arranged in horizontal, e.g. pressing Meta+P to select "Extend to right of built-in screen";
2. Go to System Settings, Display Configuration, select the left monitor (Built-in Screen in my case);
3. Deselect Enabled, then Apply.

OBSERVED RESULT
The error message appears. Both monitors remain enabled, but the "Enabled" checkbox is now deselected. The left monitor disappears from the "Edit Arrangement" preview.

EXPECTED RESULT
I should be able to disable the left monitor.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.5.91
KDE Frameworks Version: 6.22.0
Qt Version: 6.11.0
Kernel Version: 6.18.6-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics
Memory: 16 GiB of RAM (14.9 GiB usable)
Graphics Processor: AMD Radeon Graphics

ADDITIONAL INFORMATION