[Samsung Galaxy Nexus] spaboleo:
Results so far:

After 10h and around 70min of screen time, due to messaging and occasional mail checking and information look-ups, I was down to 47% of battery. Again nothing changed (auto-brightness, sync, wifi, location/pos and VoIP/SIP Call receiving always on.

I can't really take the evening into consideration as I had to join a work related Skype conference call (Voice only) for over 2h. :eek:

Had to connect it to the charger during that call. That drop of almost 45% during a just voice skype call surprised me anyways :/

As previously mentioned, the undervolting has no effect right now, due to hardcoded values in francos kernel.

All I can do is playing around with different governor and I/O scheduler combinations. dyninteractive + row seems to be really snappy. No lags or anything ever occured. But I am wondering if dyninteractive is maybe to inefficient by not limiting resources and ramping up to quickly.

Conclusion on screen brightness:

I had a couple of other android devices before and the one that sticked the longest time was the HTC Desire (AMOLED). The Desire had the ability to read the current current (sry for pun) with CurrentWidget. And due to it's AMOLED, where black for pixel means no power consumption, the choice of color scheme for frequently used apps, along with the wallpaper and of course the screen brightness had an significant impact on the overall battery life.

I can remember that a full-brightness screen with a white wallpaper/app required a current of over 600mA, whereas a black wallpaper on full-brightness was only around 400mA. Dimming the screen to the lowest possible value (CM7 allowed to tweak those brightness values to even lower states) and the phone only needed around 120mA.

That is a factor of 5 during idle time, which the phone most of the time is. While composing messages or reading an e-mail the cpu load is quite low. The biggest consumer is the screen.

Anyways because of this experience I always chose to set the Galaxy Nexus to lowest possible screen brightness. And even tried to use franco and lean kernels color multipliers to lower the brightness values. A friend always was surprised how dark my phone was compared to his Galaxy Nexus.

It is sad that the Galaxy Nexus is not compatible with CurrentWidget, it would be nice to measure the impact of such settings.

But surprisingly it all didn't make that a huge difference. My current wallpaper is plain black. I have no playful widgets (cal, gmail, mail, and aixweather) and almost no icons on the homescreens. And yet the difference between the lowest possible and still readable color multiplier settings and the quite bright ones that I use now (osm0sis: 250/300/350 and trinity contrast at -24) seems to have the same impact on the battery drain.

That really surprises me.

It seems like the screen gets inefficient at really low brightness settings. And pixels being black and for an AMOLED screen by that "turned off" don't save that much energy.

I think I'll stick for some time to the settings described above.

Woud be nice to hear other opinions and experiences on that :)

More battery life is always nice to have ;)