https://bugs.kde.org/show_bug.cgi?id=471493
Bug ID: 471493
Summary: Discrete GPU is not turning off when using on-demand
mode in Wayland session
Classification: Plasma
Product: kwin
Version: 5.27.6
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: ilk...@gmail.com
Target Milestone: ---
SUMMARY
***
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Discrete GPU is not turning off when using on-demand mode in Wayland session.
***
STEPS TO REPRODUCE
1. Open a Wayland session
2. Check compositor is enabled and discrete GPU is on-demand mode.
3. Connect an external monitor that uses discrete GPU, observe the card is
turned on ( cat runtime_status)
4. Disable the monitor using display configuration widget
OBSERVED RESULT
Discrete GPU is still turned on and high power consumption
To check this I use: cat
/sys/bus/pci/devices/0000:01:00.0/power/runtime_status
EXPECTED RESULT
In about 30 seconds discrete GPU should be turned off
NOTES:
a. Same steps on X11 works as expected.
b. If the monitor is physically disconnected (at step 4) then it works as
expected.
c. Interestingly, after step 4 if I go to compositor settings and change any
setting and apply then GPU turns off as expected.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Kubuntu
(available in About System)
KDE Plasma Version: 5.27.6
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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