Bug 488704

Summary:	[KDE Plasma 6.1.0] Monitor unable to turn on after idle.
Product:	[Plasma] kwin	Reporter:	charles2000wang
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	agurenko, carlosd.kde, jr, nate, neon-bugs-null
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.1.0
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	6.1.4
Sentry Crash Report:

Description charles2000wang 2024-06-19 02:47:45 UTC

SUMMARY
When the monitor automatically turns off after a set idle time in the power management settings, the monitor no longer can be turned on as if there is no video signal being sent to the monitor. This bug just occurred after the update to KDE Plasma 6.1.0 from 6.0.5 on KDE neon. Moving the mouse around or pressing keys on the keyboard did not wake the monitor but I was able to unpause a YouTube video while the monitor is still in standby mode. Only if I manually turned the monitor off and back on again will a video signal be sent to the monitor.

Another note: It seems that waking the monitor does work if the monitor turned off when the user is idle at the locked screen.

STEPS TO REPRODUCE
1.  Set "Turn off screen" to 5 minutes in power management settings. Did not try other time values yet.
2.  Monitor will go into standby mode since no video signal is being sent.

OBSERVED RESULT
Pressing keys or moving mouse will not wake the monitor.

EXPECTED RESULT
Monitor will wake up when moving mouse or pressing keys just like before in KDE plasma 6.0.5.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  KDE neon 6.0 - Linux kernel version 6.9.3
KDE Plasma Version: 6.1.0 with Wayland (Did not test X11)
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.0

My computer is running an AMD GPU with Wayland

Comment 1 charles2000wang 2024-06-29 21:34:57 UTC

Still occurs in Plasma 6.1.1

Comment 2 Gurenko Alex 2024-08-21 16:57:06 UTC

Just to add visibility to this issue, I'm experiencing it for a long time as well, it was definitely working during the beta time frame of Plasma 6 and I guess it broke around 6.1 release.

Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.6-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C84
System Version: 1.0

My monitor is Dell S2721dgfa connected over DisplayPort

Comment 3 Gurenko Alex 2024-08-21 16:58:05 UTC

Forgot to add, that actually I cannot get the monitor to display anything after the said issue occurs, until I power cycle it with cable removal

Comment 4 charles2000wang 2024-08-22 00:47:49 UTC

Sorry for the late reply. I no longer have this bug in KDE Plasma version 6.1.4.

Comment 5 Nate Graham 2024-08-22 01:16:40 UTC

Aha, that means your issue is subtly different, Alex. Can you open a new bug report about it?

Comment 6 Gurenko Alex 2024-08-22 07:46:20 UTC

(In reply to Nate Graham from comment #5)
> Aha, that means your issue is subtly different, Alex. Can you open a new bug
> report about it?

Sure, I've opened https://bugs.kde.org/show_bug.cgi?id=492027