Just a quick follow-up: we are using the backend that blocks on fb state
-- all a device needs is
/sys/power/{state,wake_lock,wait_for_fb_sleep,wait_for_fb_wake}

So I'm feeling confident that's a part of the puzzle here.

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https://bugs.launchpad.net/bugs/1421455

Title:
  Slow wake up time on physical power button pressed

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