Lenovo ThinkPad X1 Yoga (Gen 4)

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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
Device Working Modules
Intel graphics Yes i915, (intel_agp)
Wireless network Yes iwlmvm
Native Ethernet with dongle (sometimes not included) Yes ?
Mobile broadband Fibocom ? ?
Audio Yes snd_hda_intel
Microphone Yes³ snd_sof
Touchpad Yes psmouse, rmi_smbus, i2c_i801
TrackPoint Yes psmouse, rmi_smbus, i2c_i801
Camera Yes uvcvideo
Fingerprint reader Yes¹ ?
Power management Yes² ?
Bluetooth Yes btusb
NFC ?⁴ ?
Keyboard backlight Yes thinkpad_acpi
Function/Multimedia keys Yes ?
  1. See #Fingerprint sensor
  2. S3 suspend requires changes to BIOS settings, see section on enabling S3.
  3. The internal microphone doesn't work on versions of the linux kernel before 5.3. On version 5.3 and newer the SOF firmware can be enabled by installing sof-firmware. See #Audio.
  4. Using latest linux package and neardAUR nfctool detects the device nfc0 and shows supported protocols

Hardware

Additional hardware information from lsusb and lspci can be found below when using the linux kernel 5.5.1:

$ lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 06cb:00bd Synaptics, Inc. 
Bus 001 Device 003: ID 04f2:b67c Chicony Electronics Co., Ltd Integrated Camera
Bus 001 Device 008: ID 2cb7:0007 Fibocom MBIM + 3 CDC-ACM
Bus 001 Device 002: ID 056a:51b6 Wacom Co., Ltd Pen and multitouch sensor
Bus 001 Device 005: ID 8087:0aaa Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ lspci
00:00.0 Host bridge: Intel Corporation Coffee Lake HOST and DRAM Controller (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (Whiskey Lake) (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Cannon Point-LP Thermal Controller (rev 11)
00:13.0 Serial controller: Intel Corporation Cannon Point-LP Integrated Sensor Hub (rev 11)
00:14.0 USB controller: Intel Corporation Cannon Point-LP USB 3.1 xHCI Controller (rev 11)
00:14.2 RAM memory: Intel Corporation Cannon Point-LP Shared SRAM (rev 11)
00:14.3 Network controller: Intel Corporation Cannon Point-LP CNVi [Wireless-AC] (rev 11)
00:15.0 Serial bus controller [0c80]: Intel Corporation Cannon Point-LP Serial IO I2C Controller #0 (rev 11)
00:15.1 Serial bus controller [0c80]: Intel Corporation Cannon Point-LP Serial IO I2C Controller #1 (rev 11)
00:16.0 Communication controller: Intel Corporation Cannon Point-LP MEI Controller #1 (rev 11)
00:1d.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #9 (rev f1)
00:1d.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #13 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Cannon Point-LP LPC Controller (rev 11)
00:1f.3 Audio device: Intel Corporation Cannon Point-LP High Definition Audio Controller (rev 11)
00:1f.4 SMBus: Intel Corporation Cannon Point-LP SMBus Controller (rev 11)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Point-LP SPI Controller (rev 11)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (6) I219-V (rev 11)
03:00.0 Non-Volatile memory controller: Sandisk Corp Device 5006
05:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
06:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
06:01.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
06:02.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
06:04.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
07:00.0 System peripheral: Intel Corporation JHL6540 Thunderbolt 3 NHI (C step) [Alpine Ridge 4C 2016] (rev 02)
2d:00.0 USB controller: Intel Corporation JHL6540 Thunderbolt 3 USB Controller (C step) [Alpine Ridge 4C 2016] (rev 02)

BIOS

Updates

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 hanging, not booting into bootloader

Sometimes, the BIOS just "hangs" and you can't 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)

Audio

With the latest linux-kernel and sof-firmware installed, audio should work out of the box, also with the bass speaker.

For reference and for other kernel versions, you may try the following to make the bass speaker work:

Add to /etc/pulse/default.pa:

/etc/pulse/default.pa
...
load-module module-alsa-source device=hw:0,6 channels=4
load-module module-alsa-sink device=hw:0,0

Add to /etc/modprobe.d/alsa.conf:

/etc/modprobe.d/alsa.conf
...
options snd slots=,snd_usb_audio

See also the discussion at [1] and the instructions on the X1 Carbon Gen 7 page.

It's also been reported that the following works:

Install alsa-tools and run

$ hda-verb /dev/snd/hwC0D0 0x17 SET_CONNECT_SEL 1

Tablet Functions

For the most part, the touch screen and stylus work under Xorg after installing xf86-input-wacom package with no issues. See Tablet PC for further information.

Stylus

The default stylus buttons are mapped by the wacom driver as follows:

Physical Button Xorg mouse number
Top 2
Bottom "Eraser"

These can be changed with xsetwacom. To set the top button of the stylus to the equivalent of a middle click or Xorg mouse button 3:

# xsetwacom --set "Wacom Pen and multitouch sensor Pen stylus" Button 2 3

To register the "eraser" as a right click use:

# xsetwacom --set "Wacom Pen and multitouch sensor Pen eraser" Button 1 2

Screen Rotation

Automatic Screen Rotation in Gnome

The iio-sensor-proxy package provides automatic screen rotation for me in Gnome. Install iio-sensor-proxy.

No configuration was needed for my machine.

With Screen Rotator

Automatic screen rotation works well with ScreenRotator which has no configuration necessary. The touchscreen two finger swipe does not follow rotation at this time. Install iio-sensor-proxy-gitAUR and screenrotator-gitAUR. For KDE, there is kded-rotation-gitAUR.

Note: ScreenRotator is in early development stages.

Touchpad

Sometimes after a boot, the touchpad doesn't 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"

Configuration

Many of the configuration options can be found in Lenovo ThinkPad X1 Carbon (Gen 7), as the X1 Carbon 7 has a very similar structure to the X1 Yoga 4.