From: Nishanth Menon <menon.nishanth@gmail.com>
To: Han Wang <hw342@cornell.edu>
Cc: linux-omap@vger.kernel.org
Subject: Re: Power managment on Overo
Date: Thu, 15 Jul 2010 05:29:42 -0500 [thread overview]
Message-ID: <4C3EE316.5000506@gmail.com> (raw)
In-Reply-To: <loom.20100715T065056-117@post.gmane.org>
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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next prev parent reply other threads:[~2010-07-15 10:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-15 5:00 Power managment on Overo Han Wang
2010-07-15 10:29 ` Nishanth Menon [this message]
2010-07-15 13:17 ` Nishanth Menon
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