Using an external high refresh rate makes the KDE Plasma desktop choppy

NVIDIA Open GPU Kernel Modules Version

530.41.03

Does this happen with the proprietary driver (of the same version) as well?

No

Operating System and Version

Zenned (Manjaro KDE Minimal Variant)

Kernel Release

Linux Ultra 6.2.9-zen1-1-zen #1 ZEN SMP PREEMPT_DYNAMIC Thu, 30 Mar 2023 14:51:16 +0000 x86_64 GNU/Linux

Hardware: GPU

GeForce GTX 1650 Mobile

Describe the bug

If I connect an external high refresh rate monitor, the hole KDE Plasma desktop is choppy.

It doesn't matter the display settings:

• Disabling screens
• Cloning screens
• Which is the primary one
• If refresh rates match
• Kwin window manager settings
• Desktop effects like blur and transparency

Setting the power settings to maximum performance, and keeping the laptop screen open and powered on, seem to provide better performance.

To Reproduce

• Try the desktop without external screen.
• Try the desktop with external screen.

Bug Incidence

Always

nvidia-bug-report.log.gz

• proprietary.log.gz
• open.log.gz

More Info

No response

Start by reproducing the choppy KDE Plasma desktop with and without the external high-refresh-rate monitor, then compare the attached proprietary.log.gz and open.log.gz reports. The issue names no source files or tests, so investigation must first identify the display, refresh-rate, and power-management path involved. Done means smooth desktop performance with the external monitor while using the open module.