https://bugs.kde.org/show_bug.cgi?id=425069
Bug ID: 425069
Summary: Extreme lagg when disabling laptop display
Product: kwin
Version: 5.19.3
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 130677
--> https://bugs.kde.org/attachment.cgi?id=130677&action=edit
Lagg while dragging applications
SUMMARY
Not sure if KWIN is the right place.
When disabling my laptop display and only using my external monitor extreme
lagg occurs. My CPU is normally 5-10% in idle and after disabling the laptop
display it goes down to 0-1%. It looks like some kind of power setting is
triggered when the laptop screen is disabled. Everything works fine when using
both the laptop screen and external monitor.
STEPS TO REPRODUCE
1. Install Kubuntu 20.04 LTS or Install Manjaro 20.0.3
2. Connect external monitor using HDMI.
3. Enable external monitor, disable laptop monitor.
OBSERVED RESULT
When the laptop display is disabled extreme lagg occurs. Button clicks take
ages to register while dragging an application accros the screen the old-school
windows trail appears(see attachment). The CPU furthermore goes from 5-10% in
idle to <1 % in idle.
EXPECTED RESULT
Normal behaviour, cpu usages remaining the same, no lagg.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro with KDE Plasma 5.19.3 AND Kubuntu 20.04 with KDE
Plasma 5.18.
KDE Plasma Version: 5.19.3 with Manjaro AND 5.18 with Kubuntu
KDE Frameworks Version: 5.72.0 in Manjaro, Not sure about kubuntu
Qt Version: 5.15.0 in Manjaro, Not sure about kubuntu.
ADDITIONAL INFORMATION
System info:
HP-Pavilion 15-bc075nd
I7 6700hq with integrated Intel® HD Graphics 530
Nvidia 960m
External monitor:
LG 29UM59-P Ultrawide 2560x1080
Display settings:
Laptop Screen: Disabled
External monitor: Enabled + Primary
Compositor settings:
Scale method: Accurate
Rendering backend: OpenGL 3.1
Tearing prevention: Automatic
Keep window thumbnails: Only for shown windows
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