fast dormancy should be a battery-saving feature of UMTS networks.
- Acro S (thanks barmakinfo)
- T (thanks icstm)
- TL (thanks bsined)
- V (thanks carloskar)
- Z1 (thanks danielalarcon)
- Z1 Compact (thanks Gregz78)
- First of all, you'll need to know your carrier MCC and MNC. You can found these on wikipedia or in your APN settings
- Navigate and open ./etc/fast-dormancy/fd_custm_conf.txt
- You'll see two lines ending with MCC and MNC and two zeros
- Change those zeros with the codes you look earlier and save
- Reboot and enjoy
What is fast dormancy and why should I bother?
Fast dormancy is a GSM feature which makes switching to sleep state faster
It seems a nice thing, where should I opt-in?
You are already in! Every recent phone supports this specification and sometimes it could really extend your battery life
So, what's all this bothering?
Well, the fact is that even though phones are usually perfect from this perspective.. unfortunately carriers are not. Some support this, other doesn't.
And wrong combinations can be battery killing. See the chart
OMG, I want my sleep mode back !11
Before doing anything, we must be sure you are affected by the problem. Asking directly to your carrier could be a nice thing. But sometimes this couldn't even be enough, since everything depends upon the antenna you are actually connected to.
So, how in the world could I check if I'm affected by the problem? :\
A first usual sign of the issue would be high "Android OS" battery usage and/or lots of com.sonyericsson.android.wakeup wakelocks.
Another quick testing method would be to simply use the fix for a few days and then revert your changes back if you find them unsatisfactory
I'm screwed! My phone isn't in the list or I can't find those files!
You had better first checking if the /etc/fast-dormancy/ folder is there and try. If not, check karkand's twin thread (be warned, potential brick inside)
Is this really worth the hassle?
D E F I N I T I V E L Y. Battery can last up to 30% longer after applying this fix! (admitted you had this problem before).