ThinkPad X1 Carbon 7th gen (2019) LEDs permanently off after sleep mode

Support
1

I’m running KDE Plasma (only) with the latest stable branch Manjaro.

The ThinkPad comes with a few button LEDs (like for CapsLock, FnLock, Sound Mute and similar) which do work perfectly fine when doing a clean boot of the system. There is also a power LED on the right side that stays on permanently when the system is running and in some kind of “breathing” mode when the system is in standby mode.

There’s also a keyboard backlight, which can be adjust in three steps (0%, 50%, 100%) using the Fn + Space keys, which also works fine after a fresh system start.

The issue is, that all of these LEDs are disabled when entering the Sleep mode and waking the system back up again. The only LED that still works is the power LED, but it’s stuck in breathing mode, not permanently on.

I’ve tried to use the hardware keys, the Plasma settings and dialogs and to directy write values into the /sys tree:

sudo su
ls /sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight
brightness  brightness_hw_changed  device  max_brightness  power  subsystem  trigger  uevent

echo "1" > /sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight/brightness

cat /sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight/brightness
0

But nothing works. Somehow the LEDs are stuck in a dysfunctional state. Only rebooting the system brings them back to life.

The Fn button and all other buttons work (apart from the Fn + Space combination), but the status lights are also all gone.

Operating System: Manjaro Linux 
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.6-10-MANJARO (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-8565U CPU @ 1.80GHz
Memory: 15,4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
Manufacturer: LENOVO
Product Name: 20QDS1L100
System Version: ThinkPad X1 Carbon 7th

Any ideas where to look? :upside_down_face:

2
3

Thanks! I already knew this page and thought it must be something else.

But then I tried the “Sleep State” setting again, in the UEFI and set it back to “Linux”. The wiki page also mentions to set it – against what the name implies – to “Windows 10” on Linux, too. But it seems that this created the issue with the LEDs.

I will test it out a few times and then report back if this indeed fixed the problem.

4

…always good to look twice :ok_hand:

5

This topic was automatically closed 3 days after the last reply. New replies are no longer allowed.