For all FP2-Users, who has Fairphone Open 16.06 or 16.07 as base for the Sailfish OS:
Do not upgrade to Fairphone Open 16.08 or 16.09
Both of this versions has an update for the Modem Firmware which solve the Ambient light sensor problem but cause a much higher power consumtion under Sailfish.

Downgrading to 16.07 or 16.06 wouldn't help because this versions doesn't include this Modem Firmware.

Our hero mal- is searching for the solution now, maybe we get some older firmware images from the Fairphone to go back or we hope for 16.10 Version, which will (hopefully) fix it.

So if you din't upgraded - wait until it is confirmed, which version is safe to flash, if you alredy updated (like me and mal-) - you also need to wait. I will inform you here asap

UPDATE:
The old Modem-Files can be optained here:

http://storage.googleapis.com/fairph...-1.4.2-img.zip

Flash only the modem files, so no recovery.img and no.sysem.img