Arch Linux

Nothing4You

Member

From: Germany

Registered: 2013-03-02

Posts: 10

Thinkpad X131e wireless activity LED indicator control

Hey there,

I have an X131e (AMD) here which has a wireless activity LED indicator on its cover.
On windows it's easy to turn off the LED by disabling bluetooth and wlan, however it doesn't seem to work on arch linux.

I already looked into /sys/devices/platform/thinkpad_acpi/leds/ but it just lists three items which are all turned off:

root@gibson /sys/devices/platform/thinkpad_acpi/leds # ls -la
total 0
drwxr-xr-x 5 root root 0 Mar  2 14:00 .
drwxr-xr-x 7 root root 0 Feb 28 18:09 ..
drwxr-xr-x 3 root root 0 Mar  2 14:00 tpacpi::power
drwxr-xr-x 3 root root 0 Mar  2 14:00 tpacpi::standby
drwxr-xr-x 3 root root 0 Mar  2 14:00 tpacpi::thinkvantage

root@gibson /sys/devices/platform/thinkpad_acpi/leds # for x in *;do cat $x/brightness;done
0
0
0

Changing to 255 and back doesn't make any difference.

Then I looked into /proc/acpi/ibm/led:

root@gibson /proc/acpi/ibm # cat led
status:		supported
commands:	<led> on, <led> off, <led> blink (<led> is 0-15)

root@gibson /proc/acpi/ibm # do=on;for i in {0..15};do cat <<< "$i $do";cat <<< "$i $do" > led;done
0 on
1 on
cat: write error: Operation not permitted
2 on
cat: write error: Operation not permitted
3 on
cat: write error: Operation not permitted
4 on
cat: write error: Operation not permitted
5 on
cat: write error: Operation not permitted
6 on
cat: write error: Operation not permitted
7 on
8 on
cat: write error: Operation not permitted
9 on
cat: write error: Operation not permitted
10 on
cat: write error: Operation not permitted
11 on
cat: write error: Operation not permitted
12 on
13 on
cat: write error: Operation not permitted
14 on
cat: write error: Operation not permitted
15 on
cat: write error: Operation not permitted

root@gibson /proc/acpi/ibm # do=off;for i in {0..15};do cat <<< "$i $do";cat <<< "$i $do" > led;done
0 off
1 off
cat: write error: Operation not permitted
2 off
cat: write error: Operation not permitted
3 off
cat: write error: Operation not permitted
4 off
cat: write error: Operation not permitted
5 off
cat: write error: Operation not permitted
6 off
cat: write error: Operation not permitted
7 off
8 off
cat: write error: Operation not permitted
9 off
cat: write error: Operation not permitted
10 off
cat: write error: Operation not permitted
11 off
cat: write error: Operation not permitted
12 off
13 off
cat: write error: Operation not permitted
14 off
cat: write error: Operation not permitted
15 off
cat: write error: Operation not permitted

Which didn't seem to change either.

zlsa

Member

Registered: 2014-04-13

Posts: 1

Re: Thinkpad X131e wireless activity LED indicator control

I have the exact same issue with the same make and model, and the same errors when I try to modify any of the LEDs.