Sway sets Caps Lock LED off

[holdenrohrer]

Hi,

I like to use my caps lock key light as a low-battery indicator, and I was able to do this successfully under i3.
My udev and script setup is as follows:

/etc/udev/rules.d/99-lowbat.rules
-----
SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="[0-1]", RUN+="/usr/local/bin/low-bat off"

SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="[0-5]", RUN+="/usr/local/bin/low-bat low"
SUBSYSTEM=="power_supply", ATTR{status}=="Charging", RUN+="/usr/local/bin/low-bat chr"

/usr/local/bin/low-bat
-----
#!/bin/sh

set_led() {
    echo $1 > /sys/class/leds/input3::capslock/brightness
}

composite_bat() {
    CAPACITY="$(cat /sys/class/power_supply/BAT*/energy_full_design | awk '{s+=$1} END {print s}')"
    ENERGY="$(cat /sys/class/power_supply/BAT*/energy_now | awk '{s+=$1} END {print s}')"
    echo "1000*${ENERGY}/${CAPACITY}" | bc
}

bat_below() { # takes input as per mille
    test $(cat /sys/class/power_supply/AC/online) = 0 && test $(composite_bat) -le $1
}

set_led 0;
bat_below 50 && set_led 1;
bat_below 10 && systemctl hybrid-sleep;

And I have the caps:escape option enabled in my sway config:

~/.config/sway/config
-----
# OMITTED
input * {
    xkb_layout "us"
    xkb_variant "dvp"
    xkb_options caps:escape,lv3:ralt_switch_multikey
}
# OMITTED

When I have a tty open, my caps lock light correctly turns on when my battery gets low, but not in Sway.

Some steps to replicate

I'm on Arch Linux 2023-02-15, on a Thinkpad T480, but this should probably work with any hardware capslock lights.

1. Set input * xkb_options caps:escape in sway.
2. Be running sway.
3. In a terminal emulator open in sway, run echo 1 > /sys/class/leds/input3::capslock/brightness (at least input3::capslock is what the device is called on my laptop)
4. The light should quickly turn off after turning on.

I expect this is a fairly niche use case and probably not well-tested by the community, so replicating this would be helpful, and I'd like to see if anybody has guesses as to how to fix it (I'm betting on a dig through the code, but if there is a sway-input command I would be quite happy!)

Thank you,
Holden

[anpandey]

This seems like a wlroots thing and independent of any settings. I can confirm the same thing happens with cage using this command:

echo 1 > /sys/class/leds/input0::capslock/brightness

[triallax]

Most likely related to #5342.