Lenovo ThinkPad X1 Carbon (Gen 6)

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Revision as of 20:00, 12 July 2018 by Mrfaber (talk | contribs) (Remove boot section with "Grub issues"(not specific to this machine), expand BIOS section)
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Tip: A great resource for thinkpads is https://www.thinkwiki.org/wiki/ThinkWiki

Model description

The Lenovo ThinkPad X1 Carbon, 6th generation is an ultrabook introduced in early 2018. It comes in several variants(20KH* and 20KG*) and features a 14" screen, 8th-gen Intel Core processors and integrated Intel UHD 620 graphics.

To ensure you have this version, install the package dmidecode and run:

# dmidecode -t system | grep Version

Version: ThinkPad X1 Carbon 6th


Device Working Modules
Intel graphics Yes i915, (intel_agp)
Wireless network Yes iwlmvm
Native Ethernet with included dongle Yes ?
Mobile broadband No*** ?
Audio Yes snd_hda_intel
Touchpad Yes* psmouse, rmi_smbus, i2c_i801
TrackPoint Yes psmouse, rmi_smbus, i2c_i801
Camera Yes uvcvideo
Fingerprint Reader No** ?
Power management Yes ?
Bluetooth Yes btusb
microSD card reader Yes scsi_mod
Keyboard Backlight Yes ?
Function/Multimedia Keys Yes ?

* via workaround

** progress being made on driver

*** no working linux pcie driver for Fibocom L850-GL forum link - also see this forum for more progress.


The most convenient way to install Arch Linux is by disabling "Secure Boot" Security -> Secure Boot - Set to "Disabled". However it is possible to self-sign your kernel and boot with it enabled. For further information have a look at the Secure Boot article.

In case your efivars are not properly set it is most likely due to you not being booted into UEFI. Should the problem persist be sure to consult the UEFI#UEFI variables section.


BIOS update 1.25 was released on 2018-06-28. Obtain geteltoritoAUR and run ./geteltorito.pl -o bios-update.img n23ur08w.iso on the downloaded ISO file to create a valid El Torito image file, then flash this file on a USB drive via dd like you would flash Arch installation media. For further information see flashing BIOS from Linux.

The ThinkPad X1 Carbon supports setting a custom splash image at the earliest boot stage(instead of the red "Lenovo" logo), more information can be found in the README.TXT located in the FLASH folder of the update image.

Suspend issues

Suspend-to-RAM (S3) not supported by default

The 6th Generation X1 Carbon supports S0i3 (also known as Windows Modern Standby) and does not support the S3 sleep state. A guide exists with instructions for patching ACPI DSDT tables to add S3 support.

A forum thread has further discussion related to this issue.

S0i3 sleep support

From the Lenovo forums: Add the following kernel parameter to enable s0i3 sleep support:

Note: This disables wakeup/resume via lid open.

You might also need to disable the Realtek memory card reader (which appears to use a constant 2-3 W) either via the BIOS or via

echo "2-3" | sudo tee /sys/bus/usb/drivers/usb/unbind

BIOS configurations

  • Config -> Thunderbolt BIOS Assist Mode - Set to "Enabled". When disabled, on Linux, power usage appears to be significantly higher because of a substantial number of CPU wakeups during s2idle.

Power management/Throttling issues

Due to wrong configured power management registers the CPU may consume a lot less power than under windows and the thermal throttling occurs at 80°C (97°C when using Windows, see T480s throttling bug).

There is a post in the official Lenovo forum to inform Lenovo about this issue.

Temporary fix

Until Lenovo fixes this issue, you can manually set the limit.

To begin, install msr-tools.

Create the file /usr/local/bin/cpu-throttling.sh (making it executable) containing the following:


/bin/modprobe msr
wrmsr -a 0x1a2 0x3000000 # which sets the offset to 3 C, so the new trip point is 97 C 

Then create the associated service file /etc/systemd/system/cpu-throttling.service:

Description=set cpu heating limit to 97°c



And also the timer in /etc/systemd/system/cpu-throttling.timer:

Description=set cpu heating limit to 97°c every minute



Then, enable it:

# systemctl enable cpu-throttling.timer

Reboot and check with:

# rdmsr -f 29:24 -d 0x1a2


TrackPoint and Touchpad issues

On the 20KG model, the Touchpad(Synaptics) and TrackPoint(Elantech) do not work together, one has to disable the TrackPoint in BIOS to get the Touchpad to work reliably out of the box. The root of the issue seems to be that the default loading of the TrackPoint via ancient PS/2 drivers conflicts with Touchpad loading. Synaptics has introduced a new way of doing things named RMI(4) that fixes some those issues. Further explanation is collected in this thread.

As a workaround, add synaptics_intertouch=1 to the psmouse kernel module options, for example in the cmdline of the boot loader:

 [...] root=/dev/sda1 rw psmouse.synaptics_intertouch=1 [...]

or by editing /etc/modprobe.d/psmouse.conf:

 options psmouse synaptics_intertouch=1
Note: When using TLP with default powersaving settings, there might be occasional hiccups such as dropouts of tap-to-click functionality for the Touchpad, as well as the TrackPoint not surviving suspends and needing to be re-initialized

Reconnecting dead trackpad

echo -n "none" | sudo tee /sys/bus/serio/devices/serio1/drvctl
echo -n "reconnect" | sudo tee /sys/bus/serio/devices/serio1/drvctl


Additional resources