It's funny, but I was trying to reproduce these fails and... I can't. The phone now wakes up instantly. Maybe because of the last system update?

I tried three chargers: original, N900's and an average USB cable connected to my PC. The last one gave me double-tap issues.

Anyway, it may be my motherboard's fault. Yesterday my system froze when I connected my Jolla. And it's running Debian stable.