https://bugs.kde.org/show_bug.cgi?id=450110
Bug ID: 450110
Summary: [nvidia] Poor performances on second monitor with
on-demand prime profile
Product: plasmashell
Version: 5.24.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Multi-screen support
Assignee: plasma-b...@kde.org
Reporter: arnaud.verg...@mailo.com
CC: aleix...@kde.org, notm...@gmail.com
Target Milestone: 1.0
SUMMARY
I have a Lenovo Y520 laptop with an integrated Intel GPU and a dedicated Nvidia
GTX 1060 GPU. I am using the proprietary drivers with prime. When using the
performance mode prime profile (Nvidia GPU always on), the second monitor works
great. But when using the on-demand mode (Nvidia GPU wakes up on demand when
starting apps with env variables), the second screen has very low fps.
I also noticed the GPU usage was way higher while on-demand mode was active:
about 5% when idle on performance mode, and 20% with on-demand.
This is for X11 only as I was not able to even use the second monitor with
wayland.
I don't know what information to provide to help, or if you can do anything at
all as it is related to proprietary drivers.
STEPS TO REPRODUCE
1. Install nvidia proprietary drivers (apt install nvidia-driver-510)
2. Switch to on-demand mode (prime-select on-demand)
3. Reboot
4. Plug in second monitor
OBSERVED RESULT
Very poor performances with second monitor
EXPECTED RESULT
Second monitor should work as good as in performance mode.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.24
KDE Plasma Version: 5.24.0
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.3
Kernel Version: 5.13.0-28-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-7300HQ CPU @ 2.50GHz
Memory: 15,5 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 with Max-Q Design/PCIe/SSE2
NVIDIA driver: 510.47.03
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