SUMMARY With the ThinkPad X1 Yoga 4th, the tablet mode (which disables keyboard, trackpoint and trackpad) isn't correctly enabled when the screen is folded over **after waking up from hibernation**. WORKAROUND: Suspend and wake up again. Then the tablet mode works again. TO REPRODUCE: 1. Go into hibernation mode. 2. Wake up from there. 3. Fold over screen. OBSERVED RESULT: touchpad,keyboard and trackpoint still work EXPECTED RESULT: touchpad,keyboard and trackpoint should be disabled.
acpi_listen doesn't report any events when the tablet is folded into tablet mode when in the state described above.