FAHClient does not detect "on battery" state correctly (Linux)

[milos7250]

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Your Environment

• F@H Software version: 7.6.13
• Operating System: Linux 5.8.16-2-MANJARO x86_64
• Browser: Brave (not important) NVIDIA Optimus laptop (Lenovo Y50-70) Gnome desktop with X11 display

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Expected Behavior

FAHClient stops folding when AC power is disconnected.

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Current Behavior

FAHClient does not stop folding when AC power is disconnected. The "on battery" state is always false.

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Possible Solution (Optional)

I discussed this issue on Discord and found out that FAHClient uses cbang to determine battery state. In the cbang code, they refer to AC power supplies by path /sys/class/power_supply/AC or /sys/class/power_supply/AC0. The problem is that on my laptop, the power supply device is listed as /sys/class/power_supply/ACAD. Running $ cat /sys/class/power_supply/ACAD/online returns 0 or 1 correctly.

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Steps To Reproduce

I do not know how hard it is to reproduce this, as I do not know whether or not the device name can be manually adjusted or not.

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Context

Well, obviously, while trying to fold on my laptop, I'd love to have the ability to automatically pause folding when not connected to the wall. Right now, it is a bit obnoxius, having to run FAHControl to manually pause/unpause the client.

On a possibly related note: Another thing I noticed in the cbang code is that cbang is responsible for detecting the idle state. This is also not working right now on my laptop. I can't however figure out what information it gathers to detect the idle state.

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[oreggin]

On my Lenovo V130 the ACPI Power Supply name is ADP1:

[oreggin@v130 ~]$ sudo dmesg | grep 'AC Adapter'
[    4.909777] ACPI: AC Adapter [ADP1] (off-line)
[oreggin@v130 ~]$

The OS is the same.

[milos7250]

Alright, so we found a workaround for this problem, using udev rule and a little shell script.

I created a file /etc/udev/rules.d/80-power.rules: SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="\"/path/to/script.sh"" SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="\"/path/to/script.sh""

The content of the shell script:

#!/bin/sh

if [ $(cat /sys/class/power_supply/ACAD/online) = 1 ]; then
	FAHClient --send-unpause
else
	FAHClient --send-pause
fi

This might work without the script by simply putting RUN+="FAHClient --send-pause" in the udev rule, but I haven't tried that.

The biggest catch however is that you have to edit the udev service file to allow it to use network. I edited the file /lib/systemd/system/systemd-udevd.service and below the [Service] tag at the bottom there is a line saying IPAddressDeny=any. This denies all udev rules from using network. I added a line before that saying IPAddressAllow=localhost.

Save the service file and then run

# systemctl daemon-reload
# systemctl restart systemd-udevd

If you want to stop a short power disconnects from pausing and unpausing folding, add sleep 10 to the beginning of the shell script.

[PantherX]

Hiya @milos7250

Just wondering if this also happens in the latest release, V7.6.21 (https://foldingathome.org/alternative-downloads/)?

[milos7250]

Hey,

Yes, I've just installed the 7.6.21 version (from AUR, if that's relevant) and the problem still remains.