Dell XPS 13 Linux – HDD LED (using ShiftLock LED) Kommentare deaktiviert für Dell XPS 13 Linux – HDD LED (using ShiftLock LED)
I recently bought a Dell XPS 13 (Modell 2015) Ultrabook and I run Arch Linux on it. One thing I missed from the beginning was the absence of a drive LED. When I saw, that the XPS 13 has a white LED to signal ShiftLock directly inside the ShiftLock-Key I had an idea. Hey, I run Linux and I have total control, so why not use this ShiftLock-LED as a HardDrive LED?
The following script (running as a service) provides the Drive LED functionality on the Dell XPS 13. (Thanks to P.I. Engineering, Manwe and Stefo for their ideas)
#!/bin/bash
# save this file as pcfreakled without extension
# and make it executable (chmod +x)
#check dependencies
command -v setxkbmap >/dev/null 2>&1 || { echo >&2 "Script requires setxkbmap but it is not installed.Aborting."; exit 1; }
command -v setleds >/dev/null 2>&1 || { echo >&2 "Script requires setleds but it is not installed.Aborting."; exit 1; }
# console
CONSOLE=/dev/console
# disable caps lock key
# This can also be done within Gnome but here is also a good place
setxkbmap -option ctrl:nocaps >/dev/null 2>&1
# Check interval seconds
CHECKINTERVAL=0.1
#indicator to use [caps, num, scroll]
INDICATOR=caps
getVmstat() {
# cat /proc/vmstat|
egrep "pgpgin|pgpgout" /proc/vmstat
}
#turn led on
function led_on()
{
setleds -L +${INDICATOR} < ${CONSOLE} >/dev/null 2>&1
}
#turn led off
function led_off()
{
setleds -L -${INDICATOR} < ${CONSOLE} >/dev/null 2>&1
}
# initialise variables
NEW=$(getVmstat)
OLD=$(getVmstat)
##
while [ 1 ] ; do
sleep $CHECKINTERVAL # slowdown a bit
# get status
NEW=$(getVmstat)
#compare state
if [ "$NEW" = "$OLD" ]; then
led_off ## no change, led off
else
led_on ## change, led on
fi
OLD=$NEW
done
If your Linux distribution already uses systemd, you can use the following file to implement the above script as a daemon (assuming you placed the script in /usr/lib/systemd/scripts/pcfreakled):
[Unit] Description=PCFreaks Dell XPS13 DriveLED [Service] Type=simple ExecStart=/usr/lib/systemd/scripts/pcfreakled [Install] WantedBy=multi-user.target
Der nette Hinweis eines 
