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Recently userspace has started making more use of SW_TABLET_MODE
(when an input-dev reports this).

Specifically recent GNOME3 versions will:

1.  When SW_TABLET_MODE is reported and is reporting 0:
1.1 Disable accelerometer-based screen auto-rotation
1.2 Disable automatically showing the on-screen keyboard when a
    text-input field is focussed

2.  When SW_TABLET_MODE is reported and is reporting 1:
2.1 Ignore input-events from the builtin keyboard and touchpad
    (this is for 360° hinges style 2-in-1s where the keyboard and
     touchpads are accessible on the back of the tablet when folded
     into tablet-mode)

This means that claiming to support SW_TABLET_MODE when it does not
actually work / reports correct values has bad side-effects.

The check in the hp-wmi code which is used to decide if the input-dev
should claim SW_TABLET_MODE support, only checks if the
HPWMI_HARDWARE_QUERY is supported. It does *not* check if the hardware
ac...