Bug 500858

Summary:	Can't turn on laptop display if plug in and out external monitor when lid close, with "turn off screen when lid off" in power settings.
Product:	[Plasma] kwin	Reporter:	Wind He <g311571057>
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WAITINGFORINFO
Severity:	normal	CC:	nate, xaver.hugl
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.3.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Wind He 2025-02-28 10:11:20 UTC

SUMMARY

With "turn off screen when lid off" in power settings, close lid and plug in external monitor, then plug out, internal monitor never turn back even if I press some keys.

STEPS TO REPRODUCE
1. "turn off screen when lid off" in power settings
2. Close laptop lid
3. Plug in external monitor, wait it to display, disable laptop monitor
4. Pug out external monitor
5. Open lid, press whatever keys.

OBSERVED RESULT

Still black on laptop monitor. When I press some keys, journal says:

```
kwin_wayland_drm: Setting dpms mode failed!
```

I should only restart kwin-wayland to restore it.

EXPECTED RESULT

With any user interaction, internal monitor turn back.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700H
Memory: 15.3 GiB of RAM
Graphics Processor: Intel® Iris® Xe Graphics
Manufacturer: HP
Product Name: OMEN by HP Laptop 16-b1xxx

ADDITIONAL INFORMATION

For lid open, we have had https://bugs.kde.org/show_bug.cgi?id=486604

Configure plasma to lock screen when close lid is a workaround.

MUST keep lid close when plug in external monitor can reproduce is.

Comment 1 Wind He 2025-03-03 15:49:50 UTC

Edit:
Even if I set "lockscreen when lid close" instead of "close screen", it also happen, sometimes.

Comment 2 Zamundaaa 2025-03-06 22:38:00 UTC

I can't replicate this issue on my laptop.

Please get a drm debug log for when KWin tries to enable the display but fails. https://invent.kde.org/plasma/kwin/-/wikis/Debugging/Debugging-DRM-issues describes describes how to do that

Comment 3 Bug Janitor Service 2025-03-21 03:47:05 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Wind He 2025-03-23 15:32:54 UTC

Can't reproduce since 6.3.3. Thanks for your good works.