Lenovo ThinkPad X1 Carbon (Gen 5)

Hardware	PCI/USB ID	Working?
GPU		Yes
Wireless		Yes
Ethernet		Yes
Mobile broadband		Yes
Audio		Yes
Touchpad		Yes
TrackPoint		Yes
Webcam		Yes
Fingerprint Reader		Partial
Bluetooth		Yes
microSD card reader		Yes

Model description

Lenovo ThinkPad X1 Carbon, Gen 5.

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

TrackPoint

Lenovo uses several different trackpoint types in the 5th generation X1 Carbon. Only the standard ALPS variant has Linux support.

Fingerprint reader

See Lenovo ThinkPad T460p#Fingerprint reader; the X1 Carbon (Gen 5) and T460p use fingerprint readers with the same issue. See also https://linux-hardware.org/?id=usb:138a-0097.

Configuration

Function Key actions are "swapped"

If the action performed when pressing a Function Key is "swapped" (Example: Pressing F10 kills Bluetooth instead of sending F10), this can be reversed in BIOS.

Enter BIOS and change Config > Keyboard/Mouse > F1-F12 as Primary Function to "Enabled".

Keyboard Fn Shortcuts

• Fn+4 sends XF86Sleep (puts computer to sleep by default)
• Fn+S sends Alt_L+Sys_Req
• Fn+P sends Pause
• Fn+B sends Control_L+Break
• Fn+K sends Scroll_Lock
• Fn+Space toggles the keyboard backlight
• Fn by itself sends XF86WakeUp (wakes computer from sleep by default)

Special buttons

Some special buttons are not supported by X server due to keycode number limit.

Key combination	Scancode	Keycode
	0x49
		KEY_FAVORITES

You can remap unsupported keys using udev hwdb:

Update hwdb after editing the rule.

# udevadm hwdb --update
# udevadm trigger --sysname-match="event*"

Display

There are two options for displays:

• 14" FHD IPS (1920 x 1080): Works
• 14" WQHD (2560 x 1440): Works

Backlight Control

I had issues with the thinkpad_acpi module in linux-4.12 and linux-4.13. When loaded no acpi events are generated for Fn+F5 and Fn+F6 keypress by default, because Setting the acpi_brightness=vendor kernel parameter helped but gave issues with brightness save/restore. In linux-4.14 this issue is resolved.

TrackPoint Scrolling

TrackPoint Scrolling is working out of the box in GNOME and MATE. In some WindowManagers, the TrackPoint middle-button scrolling can be enabled by installing the package and appending the following line to your .xinitrc:

xinput set-prop "TPPS/2 ALPS TrackPoint" "libinput Scroll Method Enabled" 0 0 1

Lenovo ThinkPad Thunderbolt 3 Dockingstation

The USB-C Dock is a Thunderbolt 3 device. Plugging it in results in a whole lot of PCI entries:

06:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
07:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
07:01.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
07:02.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
07:04.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
3c:00.0 USB controller: Intel Corporation Device 15d4 (rev 02)

As of stock kernel 5.2.1, the dock is fully functional with appropriate kernel modules enabled. In particular, you must enable the kernel module. See also the Kernel module article on how to enable persistently. This driver allows the kernel to recognize the USB devices and ethernet port of the dock.

Finally, in order for the internal USB hub in the dock to work, you need to set Thunderbolt 3 security appropriately. To do this, use the tool, which can be installed via . Go to "Security level" under Thunderbolt settings in the BIOS, and set it to "Secure". After booting, attach the dock and (using the laptop's own keyboard) run to find the UUID of your dock. Following that, run to give the dock permission to access the PCIe bus automatically whenever it is plugged in. You may need to reboot your system after this. This procedure is verified to work with the X1 Carbon Gen 5 and Lenovo's dock. It may or may not work with other docks.

Also remember to enable the "Support in pre boot environment" for USB peripherals connected to the dock to work at all.

HP Thunderbolt 3 Dock

The HP Thunderbolt 3 Dock is working out of the box with the insecure method described above. It is not known whether the secure method works with this dock.

Lenovo p27h-10 (USB Type C)

Charging while using the monitor via USB-Type-C is working but the dock functionality needs investigation (e.g. speakers, mouse, directly from the monitor).

BIOS

Downloads and instructions for updating the BIOS can be found in .

In order to update the BIOS, you may either use a bootable ISO or the BIOS Update Utility for Linux. The update utility is only supported on UEFI BIOS version 1.34 or higher .

ISO

The ISO files provided by Lenovo are only bootable from a CD or DVD, not from USB. So in order to create a bootable media, you either need an external (R/W) DVD or converting the ISO file so that it can be written to a USB.

DVD

1. Download the ISO file from (and remember to validate its checksum).
2. Put a DVD in your external DVD writer, and locate what device it was assigned to (e.g., using ). For this example, we assume that it is assigned to .
3. Burn it to the DVD:
4. Reboot, enter the device boot menu by pressing F12, and carfully follow the instructions on the screen.

USB

According to Lenovo ThinkPad X1 Carbon (Gen 6)#Manual (El Torito), it is possible to create a bootable USB like so:

1. Download the ISO file
2. Install geteltorito^AUR
3. Convert the ISO image:
4. Burn bios-update.img to a USB using
5. Reboot and select the USB as boot device

Troubleshooting

Trackpoint/Trackpad not working

Several different trackpoints are used with the X1 Carbon Gen 5. There are at least three different trackpoints in use. You can identify them in dmesg as either LEN0071, LEN0072 or LEN0073.

There is a bug in Synaptics drivers that prevent both Trackpoint and Trackpad to function properly if Trackpoint is enabled at boot. This issue affects the Elantech trackpoint as well as one of the ALPS variants.

If you have the Elantech trackpoint, identified as LEN0073 you will see the following in your dmesg log.

kernel: psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
kernel: psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
kernel: psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
kernel: psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
kernel: psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
kernel: psmouse serio1: issuing reconnect request

Add psmouse.synaptics_intertouch=1 to your kernel parameters.

TrackPoint stops working after waking up from suspend

A workaround is to manually insert the elan_i2c module after waking up from suspend:

# modprobe elan_i2c

See this bugticket for details.