Lenovo ThinkPad X390 Yoga
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.
One option for fixing the touchscreen after resume is reloading the wacom kernel module:
#!/bin/bash case $1/$2 in pre/*) # echo "Going to $2..." /usr/bin/rmmod wacom ;; post/*) # echo "Waking up from $2..." /usr/bin/modprobe wacom ;; esac
This reloads the wacom kernel module during standby and fixes the issue for me. Other possible options can be found in the related ThinkPad articles, like disabling Thunderbolt or using rtcwake for 1 second. Both options did not work reliably for me.
The touchscreen appears to perform much better using libinput. Created the following file:
Section "InputClass" Identifier "touchscreen config" MatchProduct "Wacom|WACOM|PTK-540WL|ISD-V4" MatchDevicePath "/dev/input/event*" MatchIsTouchscreen "on" Driver "libinput" Option "Tapping" "true" Option "TappingDrag" "true" EndSection
This uses libinput and fixes scrolling with the finger in the desktop environment.
Experimental support is available if you install a testing firmware to the device and  for details.AUR from the AUR. See
- The key is visible to
xevand similar tools.
- The physical key has a symbol on it, which describes its function.