High CPU Usage (50-90%) When Using External Monitor on NVIDIA GPU

[1DiEgo11]

Already reported ? *

• I have searched the existing open and closed issues.

Regression?

I don't know, I started using Hyprland only recently

System Info and Hyprland Version

System/Version info

Hyprland 0.47.2 built from branch  at commit 882f7ad7d2bbfc7440d0ccaef93b1cdd78e8e3ff  (version: bump to 0.47.2).
Date: Sun Feb 2 00:47:17 2025
Tag: v0.47.2, commits: 5767
built against:
 aquamarine 0.7.2
 hyprlang 0.6.0
 hyprutils 0.5.0
 hyprcursor 0.1.11
 hyprgraphics 0.1.2


no flags were set


System Information:
System name: Linux
Node name: kairos
Release: 6.13.4-arch1-1
Version: #1 SMP PREEMPT_DYNAMIC Sat, 22 Feb 2025 00:37:05 +0000


GPU information: 
0000:00:02.0 VGA compatible controller [0300]: Intel Corporation TigerLake-LP GT2 [Iris Xe Graphics] [8086:9a49] (rev 01) (prog-if 00 [VGA controller])
	DeviceName: VGA
0000:01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GA106M [GeForce RTX 3060 Mobile / Max-Q] [10de:2520] (rev a1) (prog-if 00 [VGA controller])
	DeviceName: Second VGA
NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.16  Fri Jan 24 21:25:51 UTC 2025


os-release: NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
ANSI_COLOR="38;2;23;147;209"
HOME_URL="https://archlinux.org/"
DOCUMENTATION_URL="https://wiki.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://gitlab.archlinux.org/groups/archlinux/-/issues"
PRIVACY_POLICY_URL="https://terms.archlinux.org/docs/privacy-policy/"
LOGO=archlinux-logo


plugins:

Description

I’m experiencing abnormally high CPU usage (50-90%) in Hyprland when interacting with the system (e.g., moving the mouse, typing) only on an external monitor. The issue disappears completely when using the laptop’s built-in display.

How to reproduce

Connect an external monitor to the NVIDIA GPU.

Launch Hyprland and switch to the external monitor.

Move the mouse cursor or type in any window.

Observe CPU usage via htop/btop.

Attach not paste

• I understand that all text files must be attached, and not pasted directly. If not respected, this issue will likely get closed as spam

Checklist of files to include below

• Hyprland config - hyprctl systeminfo -c (always include)
• Crash report (always include in case of crash)
• Video (always include in case of a visual bug)
• Logs (might contain useful info such as errors)

Additional info & File uploads

hyprland_config_dump.txt

[oshitaka]

same thing