Lenovo ThinkPad X1 Yoga (Gen 4)

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Reason: Stub (Discuss in Talk:Lenovo ThinkPad X1 Yoga (Gen 4)#)

The Lenovo ThinkPad X1 Yoga, 4th generation is a 2-in-1 convertible laptop introduced in late 2019. Its design is closely related to the Lenovo ThinkPad X1 Carbon (Gen 7). It 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 Yoga 4th
Hardware PCI/USB ID Working?
Touchpad Yes
TrackPoint Yes
Keyboard Yes
Video Yes
Webcam 04f2:b67c Yes
Ethernet Yes
Bluetooth Yes
Audio Yes
Wireless Yes
Mobile broadband Untested
Fingerprint reader Yes
NFC Yes

Firmware

Updates

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 hanging, not booting into bootloader

Sometimes, the BIOS just "hangs" and you cannot do anything but force-power off. This was fixed in the latest version of the Synaptics touchpad which you can install using fwupdmgr.

S3 Suspend Bug with Bluetooth Devices

Occasionally your Thinkpad will wake up immediately after suspending with certain bluetooth devices added. To prevent this, remove the devices or disable bluetooth before suspending.

Enabling S3

The BIOS has two "Sleep State" options, called "Windows" and "Linux", which you can find in at Config -> Power -> Sleep State. The Linux option is the traditional S3 power state where all hardware components are turned off except for the RAM, and it should work normally. The Windows option is a newer software-based "modern standby" which works on Linux (despite the name). One possible benefit to the Windows sleep state is faster wake up time, and one possible drawback is increased power usage.

Reboot and verify whether S3 is working by running:

# dmesg | grep -i "acpi: (supports"

You should now see something like this:

 [    0.230796] ACPI: (supports S0 S3 S4 S5)

Touchpad

Sometimes after a boot, the touchpad does not work. This was fixed in the latest firmware for the Synaptics device which you can install using fwupdmgr.

Fingerprint sensor

Install the latest fprintd package. Also install the firmware modules with fwupdmgr from the lvfs-testing remote:

 $ fwupdmgr enable-remote lvfs-testing
 $ fwupdmgr refresh
 $ fwupdmgr update

See fprint for more details on how to setup fingerprints.

NFC

See https://github.com/nfc-tools/libnfc/issues/455

Hidden Fn-Keys

Key combination effect
Fn+B Break
Fn+K ScrollLock
Fn+P Pause
Fn+S SysRq
Fn+4 Sleep
Fn+Space toggle keyboard backlight
Fn+Left Arrow Home
Fn+Right Arrow End
Fn+Esc toggle FnLock
Fn+L "low power mode"
Fn+M "normal power mode"
Fn+H "high power mode"