Comment # 12 on bug 811801 from Martin Szulecki

@David:
Your failure log shows completely correct behavior.
Since iOS 7, Apple added a trust dialog which prompts before allowing your
computer to access it in any way (even over PTP).
The gphoto2 software doesn't know how to handle the trust dialog and just keeps
on trying.
What you need to resolve your issue is a recent usbmuxd package.
Only that will make your iOS device stop to show the trust dialog
appropriately.
Closing this bug again as we've achieved this with the latest updates to the
packages.

I maintain an openSUSE 13.1 repository with proper iOS device support here:
http://download.opensuse.org/repositories/home:/FunkyM:/iOS/openSUSE_13.1/