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OpenMoko at mauve.plus.com
Fri Jul 27 22:33:22 CEST 2007
Nelson Castillo wrote:
> On 7/27/07, Mark Eichin <eichin-openmoko at thok.org> wrote:
>>>3: How long does the device run on a battery?
>>On an 850mAh nokia battery... maybe 3 hours mostly idle (not sure, I
>>came back to find it dead.) Haven't timed it with the 1200mAh "real"
>>battery, but basically, "power management isn't really there yet."
> Is it hard to do it? Would using NO_HZ in the kernel help?
See the Neo1973 Power Managment page in the wiki.
Basically - AIUI - there need to be custom drivers to vary the voltage
and frequency of the CPU, to enable slow-mode, and to turn on and off
various chip modules.
Then, the hard part of getting it to resume from 'sleep' - which is the
CPU completely off, and suspended to RAM in under a second or so.
NO_HZ at this stage would do little. The CPU uses almost the same power
when running flat out as when idle, but not in idle-mode.
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