[SOLVED] Two power supplies in xfce4-power-manager-settings

qonos68 · 2024-02-19 10:58:56

Hello everyone,
I recently moved from Manjaro XFCE to Debian XFCE on my Lenovo Thinkpad L570, and I'm facing a problem with power management.
Long story short, my system claims it has two different power supplies: line_power_ACAD and line_power_AC. Whilst line_power_ACAD reflects the current power supply status (plugged in/unplugged), line_power_AC reflects the status when upower was started (system startup / upower restart). When I unplug the power supply (line_power_ACAD), my system thinks it is still plugged to line_power_AC and never activates battery's power management policies. On the other hand if the system is started unplugged then line_power_AC always shows unplugged and everything works fine.
This is what upower -d outputs when power supply is unplugged but the system was started with power supply plugged in:
Device: /org/freedesktop/UPower/devices/line_power_ACAD
native-path: ACAD
power supply: yes
updated: lun 19 feb 2024, 19:40:56 (5 seconds ago)
has history: no
has statistics: no
line-power
warning-level: none
online: no
icon-name: 'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/line_power_AC
native-path: AC
power supply: yes
updated: lun 19 feb 2024, 19:00:41 (2420 seconds ago)
has history: no
has statistics: no
line-power
warning-level: none
online: yes
icon-name: 'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: LGC
model: 00NY486
serial: 1385
power supply: yes
updated: lun 19 feb 2024, 19:41:01 (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 24,13 Wh
energy-empty: 0 Wh
energy-full: 33,19 Wh
energy-full-design: 47,52 Wh
energy-rate: 7,809 W
voltage: 11,221 V
charge-cycles: N/A
time to empty: 3,1 hours
percentage: 72%
capacity: 69,8443%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1708339252 72,000 charging
1708339192 71,000 charging
History (rate):
1708339261 7,809 discharging
1708339257 8,875 discharging
1708339256 25,572 discharging
1708339252 24,889 charging
1708339222 24,859 charging
1708339192 24,835 charging
1708339162 24,809 charging

Device: /org/freedesktop/UPower/devices/DisplayDevice
power supply: yes
updated: lun 19 feb 2024, 19:41:01 (0 seconds ago)
has history: no
has statistics: no
battery
present: yes
state: discharging
warning-level: none
energy: 24,13 Wh
energy-full: 33,19 Wh
energy-rate: 7,809 W
charge-cycles: N/A
time to empty: 3,1 hours
percentage: 72%
icon-name: 'battery-full-symbolic'

Daemon:
daemon-version: 0.99.20
on-battery: no
lid-is-closed: no
lid-is-present: yes
critical-action: HybridSleep

As a sidenote I use tlp to limit battery charging, /etc/tlp.conf being completely commented with the exception of
START_CHARGE_THRESH_BAT0=85
STOP_CHARGE_THRESH_BAT0=90

Is there a way to get rid of line_power_AC? Any hint to solve this problem would be appreciated.

Last edited by qonos68 (2024-02-20 13:14:20)

ToZ · 2024-02-19 18:13:05

Hello and welcome.

I'm assuming that you didn't have the problem in Manjaro. You don't mention the version of Debian, but it would be interesting to compare the version differences of:
- xfce4-power-manager
- kernel
- upower

Perhaps a change there might account for the difference. xfce4-power-manager will only display/manage what upower tells it.

I also came across this this upower bug report that looks relevant. Interesting is that in one of the comments talks about creating an override that can ignore one of the line power supply entries.

qonos68 · 2024-02-20 05:48:17

Hello ToZ, thanks for your reply even if it looks like it doesn't have anything to do with XFCE. I apologise.
I checked the informations you asked me

Manjaro
xfce4-power-manager 4.18.2-1
upower 1.90.2-1
Kernel 6.1.62-1-MANJARO

Debian
xfce4-power-manager 4.18.1-1
upower 0.99.20-2
Kernel 6.1.0-18-amd64

Manjaro behaves like Debian, oddly enough I was remembering differently..
Thank you for the provided link, this is exactly what I was looking for, the thread was started 9 months ago but it looks like it has been just revived yesterday.
Monitoring system events through udevadm monitor and connecting/disconnecting power supply actually kicks events on BAT0 and ACAD, never AC as expected from the behaviour of upower, so maybe there is a bug somewhere.
I will follow the thread you brought to my attention and join it if necessary.

qonos68 · 2024-02-20 12:43:48

For the sake of completeness, according to the owner of upower forum, it doesn't look a problem of upower, but rather something related to the kernel driver.
Anyway I implemented the workaround suggested in the post inserting in the section [Service] of upower.service the line:

InaccessiblePaths=/sys/class/power_supply/AC /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:19/PNP0C09:00/ACPI0003:00/power_supply/AC /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:19/PNP0C09:00/ACPI0003:00

(This line must be altered to fit the real paths of one's own system, of course)

After a reboot, the offending line_power_AC is ignored and the system behaves correctly when it's unplugged from power supply.

ToZ · 2024-02-20 13:11:12

Thanks for sharing the outcome. Can you edit your first post and prepend "[SOLVED]" to the subject line?

qonos68 · 2024-02-20 13:15:09

Done, thanks again for your support.

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#1 2024-02-19 10:58:56

[SOLVED] Two power supplies in xfce4-power-manager-settings

#2 2024-02-19 18:13:05

Re: [SOLVED] Two power supplies in xfce4-power-manager-settings

#3 2024-02-20 05:48:17

Re: [SOLVED] Two power supplies in xfce4-power-manager-settings

#4 2024-02-20 12:43:48

Re: [SOLVED] Two power supplies in xfce4-power-manager-settings

#5 2024-02-20 13:11:12

Re: [SOLVED] Two power supplies in xfce4-power-manager-settings

#6 2024-02-20 13:15:09

Re: [SOLVED] Two power supplies in xfce4-power-manager-settings

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