https://bugs.kde.org/show_bug.cgi?id=514678
Bug ID: 514678
Summary: NVIDIA GPU's power drops when game is in focus when
using external monitor in hybrid graphics mode
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 188577
--> https://bugs.kde.org/attachment.cgi?id=188577&action=edit
Power usage graph
SUMMARY
When playing doom ethernal, It works fine and gives me around 160+ FPS for like
first 5 minutes after launching the game. Then, suddenly, performance drops to
around ~50 FPS and the game becomes very stuttery.
I've tracked down the problem and it seems that dGPU (5060 laptop) is loosing
power. I plotted GPU power usage in KDE System Monitor, and when I minimize the
game, I see a jump in power usage. When I focus the game again, the power usage
drops. Please see attached screenshot
This happens in all three modes - Windowed, Borderless Window and Fullscreen.
At around ~50W, I do get playable ~160FPS but when it drops to ~27W, I get
~50FPS and it becomes stuttery.
I think I have similar behavior in cs2 and dota2 as well.
The issue does not happens when laptop's internal is turned off. It also
doesn't happen if I use internal display only and disconnect the monitor. Issue
does not happen if If disable iGPU from bios
My external monitor is connected to iGPU and I'm not using reverse prime.
STEPS TO REPRODUCE
1. Connect external monitor to laptop with hybrid graphics. Make sure to
connect monitor to iGPU and not dGPU
2. Start Doom Ethernal, CS2 or Dota2 (only tested with these) on external
display
3. Notice sudden drop power used by dGPU.
4. Switch to different window (alt+tab) and observe that GPU power usage is
increased
I'm not sure if its KDE bug but since power to GPU is restored when window is
not in focus makes me think that it has to do something window manager falsely
reporting to window focus status to driver/game. If KDE devs can guide me more
on how to debug this, that would be helpful as well
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.5-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 250 w/ Radeon 780M Graphics
Memory: 72 GiB of RAM (66.6 GiB usable)
Graphics Processor 1: AMD Radeon 780M Graphics
Graphics Processor 2: NVIDIA GeForce RTX 5060 Laptop GPU
Manufacturer: LENOVO
Product Name: 83JG
System Version: LOQ 15AHP10
ADDITIONAL INFORMATION
Related post - https://bbs.archlinux.org/viewtopic.php?pid=2283264#p2283264
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