On 07/15/2010 12:00 AM, Han Wang wrote:
Hi, All,
I am running the linux-pm-kernel v2.35.rc3 on Overo Earth. I have managed to
suspend the system using "echo mem> /sys/power/state" with "enable_off_mode"
and "sleep_while_idle" enabled. Currently, I am able to achieve 200mW in suspend
mode. However, I am seen in other posts, such as this one (http://old.nabble.com/
Overo-boot-time--power-management-ts28402656.html#a28463135), that
people are able to achieve a much lower power signature.
Did you check if you have actually shut off the voltages on vdd1 and
vdd2 when you hit OFF? easy to check with a voltmeter/scope on vdd1&vdd2
capcacitors.
I am particularly interested to know what mode has the SDRAM on Overo been set to
during suspend mode? Is it auto-refresh or self-refresh? And whether the TPS/TWL
power management chip is set to low power mode during suspend mode by the pm
kernel, if not, how to set it?
Thanks,
Han
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