When I fold the screen back on my Lenovo X1 Yoga using Ubuntu 18.04, both the internal mouse (touchpad) and an external USB mouse are completely disabled. Presumably, the mouse is being disabled in order to keep the internal touchpad from messing things up when using the laptop as a tablet (the touchscreen still works correctly) - but I'd still like to be able to use an external mouse while the laptop is folded. With my Yoga installed under Ubuntu 16.04, the external mouse still works while in tablet mode.
I've scoured dconf-editor (the /org/onboard/auto-show/tablet-mode-detection-enabled flag has no effect), played around with xinput props, and searched for any indication of where I might be able to configure this behavior, but haven't yet found anything that controls the tablet mode mouse behavior. Any pointers?
Edit: Here's the output of gsettings list-recursively | grep -i tablet:
org.gnome.desktop.peripherals.tablet area [0.0, 0.0, 0.0, 0.0]
org.gnome.desktop.peripherals.tablet keep-aspect false
org.gnome.desktop.peripherals.tablet left-handed false
org.gnome.desktop.peripherals.tablet mapping 'absolute'
org.gnome.desktop.peripherals.tablet display ['', '', '']
org.gnome.power-manager info-last-device '/org/freedesktop/UPower/devices/tablet_wacom_battery_0'
org.onboard.auto-show tablet-mode-leave-key 0
org.onboard.auto-show tablet-mode-state-file-pattern '1'
org.onboard.auto-show tablet-mode-enter-key 0
org.onboard.auto-show tablet-mode-state-file ''
org.onboard.auto-show tablet-mode-detection-enabled true
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