Lenovo ThinkPad X1 Carbon (Gen 6)
- 1 Model description
- 2 BIOS
- 3 Suspend issues
- 4 Power management/Throttling issues
- 5 TrackPoint and Touchpad issues
- 6 Full-disk encryption
- 7 Tools
- 8 References
- 9 Additional resources
The Lenovo ThinkPad X1 Carbon, 6th generation is an ultrabook introduced in early 2018. It comes in several variants(
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 and run:
# dmidecode -t system | grep Version Version: ThinkPad X1 Carbon 6th
|Intel graphics||Yes||i915, (intel_agp)|
|Native Ethernet with included dongle||Yes||?|
|Touchpad||Yes||psmouse, rmi_smbus, i2c_i801|
|TrackPoint||Yes||psmouse, rmi_smbus, i2c_i801|
|microSD card reader||Yes||scsi_mod|
** the Validity90 project began reverse engineering the reader, but updates have stopped recently.
*** S3 suspend requires changes to BIOS settings - see section on suspend issues for details.
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.
Automatic Linux Vendor Firmware Service
In August of 2018 Lenovo has joined the Linux Vendor Firmware Service(LVFS) project, which enables firmware updates from within the OS. BIOS updates (and possibly other firmware such as the Thunderbolt controller) can be queried for and installed through fwupd.
BIOS update 1.30 was released on 2018-09-07. Obtain AUR and run
geteltorito.pl -o bios-update.img n23ur11w.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.
Since BIOS version 1.30, the X1 Carbon supports S3 mode when enabled in the BIOS menu (choose "Linux" sleep mode instead of the default "Windows 10"). See #Automatic_Linux_Vendor_Firmware_Service for instructions to update and verify your BIOS version.
To enable S3 support, make sure you have at least BIOS version 1.30 installed. Then, go into the BIOS configuration, and
Config -> Power -> Sleep State - Set to "Linux". This should make S3 available. To verify, after making the changes in the BIOS configuration, boot into Linux, and run the
dmesg command again to make sure that S3 is now available.
To check whether S3 is recognized and usable by Linux, run:
dmesg | grep -i "acpi: (supports"
and check for
S3 in the list.
Disabling the memory card reader
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
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.
An easy package has been written to address the problem until (or if) Lenovo ever solves it.
InstallAUR, then run:
sudo systemctl enable --now lenovo_fix.service
The script also supports more advance thermal/performance features including CPU undervolting. See the lenovo-throttling-fix repository
README.md for details.
TrackPoint and Touchpad issues
[...] root=/dev/sda1 rw psmouse.synaptics_intertouch=1 [...]
or by editing
options psmouse synaptics_intertouch=1
Reconnecting a dead trackpad can be done via
echo -n "none" | sudo tee /sys/bus/serio/devices/serio1/drvctl echo -n "reconnect" | sudo tee /sys/bus/serio/devices/serio1/drvctl
With LUKS for root, i915 needs to be loaded in ramdisk in order to access the password prompt.
Add i915 to MODULES list in
/etc/mkinitcpio.conf and regenerate the ramdisk.
s-tui ( AUR): an aesthetically pleasing and useful curses-style interface that shows graphs of CPU frequency, utilization, temperature, and power consumption. It also has a built in stress tester.
intel_gpu_top ( ): gives you some top-like info for the integrated GPU. This can be quite useful in diagnosing GPU acceleration issues.
powertop ( ): provides detailed information about CPU power consumption and recommendations on how to improve it.
tlp-stat ( ): a much simpler alternative to remembering which
cat /sys/devices/system/* to run in many cases. It can give very detailed, structured information about components like the battery, processor, graphics card, etc.
- T480s throttling bug, affects X1C6 as well
- Lenovo forums: T480s low cTDP and trip temperature in Linux
- Thread: TrackPoint/Touchpad issues, 20KG model
- StackExchange: Success with enabling RMI4 config flags for Touchpad and TrackPoint
- Kernel patch - Input: elantech - add support for SMBus devices
- Kernel patch - Input: synaptics - add Lenovo 80 series ids to SMBus
- Early KMS start: Adding i915 to ramdisk
- ThinkWiki X1 Carbon 6th Gen page
- Benjamin Tissoires, kernel maintainer of peripherals, has explained how input bugs get fixed in his talk Tools to debug a broken input device (Slides), especially interesting are slides 16 onward.
- Dell XPS 13 9370 quirks: Some pointers on getting Watt usage down to ~2W, Intel video powersaving features might be interesting, see also the Intel Graphics page for interesting power-saving options.
- Dell XPS 13 (9360): Shares some hardware with the X1C6
- Intel Blog: Best practice to debug Linux* suspend/hibernate issues, including the pm-graph tool to analyze power usage during suspend
- A comprehensive example Arch install for the X1C6