Do the following:
- Unplug Jolla from USB/wall charger
- Login via WLAN to Jolla from PC
- Run top
- Hands away from keyboard

EXPECTED OUTCOME: Top refreshes every few seconds
ACTUAL OUTCOME: Top output does not refresh. It appears as if it hung. Pressing a key refreshes it.

This happens on every other Android device out there too. And on the HP Touchpad.

The device awakens every time there's some traffic (and keeps awake for a few seconds after that because of some Android design failure), so things like sshfs will work. But it will not wake for SIGALRMs, select() timeouts, and other common POSIXy things. It is unusable as a pocket computer.

If your device still refreshes then some other device on your network is throwing unicast traffic to your Jolla, keeping it awake. But I doubt this.