https://bugs.kde.org/show_bug.cgi?id=502459
Bug ID: 502459
Summary: KDE switches to On Battery profile under heavy load
while power supply is still online
Classification: Plasma
Product: plasmashell
Version: 6.3.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: snake.sc...@gmail.com
Target Milestone: 1.0
SUMMARY
On a gaming laptop (Lenovo Legion 9 16IRX9) under heavy load (in my case
playing Monster Hunter Wilds) KDE sporadically switches between On Battery and
On Power Supply power management modes even though the power supply is
connected all the time as indicated by the hardware power LED on the laptop.
STEPS TO REPRODUCE
1. Make sure the laptop is in the gaming mode by pressing Fn+Q repeatedly until
the ring around the power button is red
2. Start a demanding game
OBSERVED RESULT
The system is switching to the On Battery profile every few seconds: screen
dimming, performance dropping, fans spinning down, the electric plug pictogram
disappearing from the battery icon in the tray. Then after a few seconds it is
switching back to On Power Supply and keeps cycling.
EXPECTED RESULT
The system remains on the On Power Supply profile as long as the power supply
is connected.
SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.3
ADDITIONAL INFORMATION
When KDE switches to On Battery, `upower -d` reports that the power supply ADP0
is still online. However the battery BAT0 is either "not charging" or
"discharging", probably because the power supply is at the limits of what RTX
4090 demands from it. I suspect that KDE wrongly interprets this as being on
battery power. Probably as a workaround for buggy power supply reporting on
other systems.
The cycling probably happens because normally the On Battery profile enables
Power Saving, which reduces power consumption, the battery gets a chance to
charge, which KDE interprets as being plugged in. And the cycle repeats.
My workaround for now is to set up the On Battery profile exactly the same as
the On Power Supply. So even though KDE still thinks I'm unplugged, nothing
changes (because the settings are the same), and everything keeps working
because in reality I'm plugged in and there is enough power for the system to
function at full performance.
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