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 and run:
# dmidecode -t system | grep Version Version: ThinkPad X1 Yoga 4th
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
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)
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.
Install the latest lvfs-testing remote:package. Also install the firmware modules with fwupdmgr from the
$ fwupdmgr enable-remote lvfs-testing $ fwupdmgr refresh $ fwupdmgr update
See fprint for more details on how to setup fingerprints.
|Fn+Space||toggle keyboard backlight|
|Fn+L||"low power mode"|
|Fn+M||"normal power mode"|
|Fn+H||"high power mode"|