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The VBDL ACPI method enables button/switch reporting through the
intel-vbtn device. In some cases the embedded-controller (EC) might
call Notify() on the intel-vbtn device immediately after the
the VBDL call to make sure that the OS is synced with the EC's
button and switch state.
If we register our notify_handler after evaluating VBDL this means
that we might miss the Notify() calls made by the EC to sync the
state.
E.g. the HP Stream x360 Convertible PC 11 has a VGBS method which
always returns 0, independent of the actual SW_TABLET_MODE state
of the device; and immediately after the VBDL call it calls
Notify(0xCD) or Notify(0xCC) to report the actual state.
Move the evaluation of VBDL to after registering our notify_handler
so that we don't miss any events.
Cc: Elia Devito <eliadevito@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210115161850.117614-4-hdegoede@redhat.com
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