Bug 464718 - NVIDIA Optimus: When using NVIDIA GPU, high CPU usage when switching to different TTY
Summary: NVIDIA Optimus: When using NVIDIA GPU, high CPU usage when switching to diffe...
Status: REPORTED
Alias: None
Product: plasmashell
Classification: Plasma
Component: generic-performance (show other bugs)
Version: 5.26.4
Platform: Manjaro Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-01-23 23:29 UTC by Oleksii Zolotarevskyi
Modified: 2025-01-25 11:04 UTC (History)
2 users (show)

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Description Oleksii Zolotarevskyi 2023-01-23 23:29:32 UTC 
SUMMARY
After switching to different TTY with Ctrl+Alt+F2, the process "plasmashell" starts using 100% CPU. The cooling fans also begin to ramp up.
Only happens when Nvidia is set as primary GPU. Doesn't happen when using Intel graphics.
When all non standard tray apps are closed, the problem persists.
When process "plasmashell" is killed, the CPU usage returns to normal.

STEPS TO REPRODUCE
1. Log into Plasma session
2. Switch to different TTY

OBSERVED RESULT
Process "plasmashell" starts using 100% CPU, when checked in "top".
Cooling fans ramp up.

EXPECTED RESULT
Process "plasmashell" doesn't use 100% CPU.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro Stable
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Graphics Platform: X11

ADDITIONAL INFORMATION:
Laptop with Nvidia+Intel graphics
Nvidia driver version: 525.60.11
Comment 1 Nate Graham 2025-01-09 20:42:07 UTC 
Sorry it took us so long to get to this. Are you still able to reproduce the issue in Plasma 6.2.5 or later? I can't try to reproduce it myself since I have no NVIDIA hardware.

Thanks!
Comment 2 Oleksii Zolotarevskyi 2025-01-10 02:36:12 UTC 
No problem!
Unfortunately still present on Arch with Plasma 6.2.5
Comment 3 Bug Janitor Service 2025-01-25 03:47:03 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 Oleksii Zolotarevskyi 2025-01-25 11:04:00 UTC 
Hi, just to clarify. The issue is still present in Plasma 6.2.5.