----- Original Message -----
My take on this is that we want the feature, but not as a 'try to see if it works' feature. So my suggestion is as follows:
- We disable it by default
In systemd, either in the Fedora package or upstream, and document how to enable it again for power users in the release notes.
- We develop some kind of whitelisting system to allow us to enable this on
systems we know it works (maybe tie it into the whitelisting system Hans has created for other power saving features?)
That means adding more code to the "Can*" D-Bus methods in systemd as well.
- Once we have this is place we can discuss doing a UI to allow people to
tweak behaviour of this, like they do on MacOS X, but it would be a UI that is only visible for people on whitelisted systems to tweak between known behaviours, not a 'try to turn this on to potentially break your system' UI.
Again, that behaviour is implemented in systemd itself, I'm sure they'd rather have hibernation be triggered on battery level, or at least making that timeout configurable.