Werner Almesberger wrote:
steve wrote:
Maybe I did get a flakely phone.
It's not so easy :-) The PMU state depends on what the PMU did the
last time you had full power.
Many internal settings only return to defaults in the so-called
NoPower state, which means that all power sources are gone, including
the backup battery. (The small "button" cell near the AUX button.)
So if there is still juice in the backup battery (which should
generally be the case), your PMU can be in a number of different
states even after you cycle USB and main battery.
If you drained your battery while running Linux, you probably didn't
have USB connected at that time. This in turn means that the internal
charger logic in the PMU should be turned off.
Sean, it should be interesting to see if you can still power on from
USB alone if you first put in a good battery, boot into Linux,
disconnect USB, and then eject the battery.
I think you have this well understood. It does exactly as you predicted
and will not power up for me with USB if I follow your procedure.
