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I'm not talking about the "white screen of sleep", that happens when you press the power button a few seconds.
The hardware has means to reboot if software is left in broken state. To force a reboot you do:
1. press for 15 - 20 seconds
2. release the power button just a sec
3. press again a few seconds.
That will force a full reboot even on a kernel deadlock.
The same procedure, without releasing the power button, will eventually trigger a poweroff (or a reboot if something changed on the PMIC side)
I do remember that, because when I got my PW1 I soldered a TTL adapter on the serial header and checked that it behaves mostly like my kobo mini (ie: ARM cores are shutdown, power manager circuit it is still alive)
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