Re: H4100-port Digest, Vol 36, Issue 6

Started my Ipaq 4150 <Hard Reset> at 1938hrs PST, 29 Jan 07, @100%, will
report back as to % remaining tomorrow at 1939hrs

Cheers

Jod

On 1/29/07, h4100-port-request_at_handhelds.org <
h4100-port-request_at_handhelds.org> wrote:
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> Today's Topics:
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> 1. Power management report (Paul Sokolovsky)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Jan 2007 07:53:30 +0200
> From: Paul Sokolovsky <pmiscml_at_gmail.com>
> Subject: [H4100-port] Power management report
> To: h4100-port_at_handhelds.org
> Message-ID: <1069450297.20070129075330_at_gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hello h4100-port,
>
> Port is nearing completion, and I started to whip PM and DPM into
> shape. I've found another power leak - during running state though -
> due to RS232 transceiver being always on. As for suspended state, it
> appears that proper LCD powerdown was major win. I made careful review
> of ASIC3 GPIO state during suspend, and cursory - of CPU GPIO, and it
> appears to be correct. Over last 24hrs, I performed clean test of power
> consumption during suspend, on a kernel with bare minimal initrd. I
> started with fully charged battery, suspended device and woke it up
> just few times to take metrics:
>
> 07:09 4017 84 2121 1896 1832 0
> 15:33 4010 97 2123 2095 1832 0
> 15:47 3984 98 2133 1973 1831 0
> 07:27 3970 97 2100 1616 1830 0
>
> Second column is voltage in raw units, third is current also in raw
> units. One thing to note here is that current immediately after boot
> from wince is lower than later when suspended and resumed in Linux.
> So, something is still missing here, I guess, CPU frequency settings.
>
> Anyway, as you see, battery didn't discharge too much, even in terms
> of raw units. Immediately after last sampling I rebooted to wince, and
> battery indicator showed 85%. Nowhere like bad, that should give 5-6
> days' life in suspend. And I yet have to test what wince gives me -
> device was bought spring 2004, so battery is not at its best by now.
>
> I'll commit soon battery classdev support which will allow detailed
> sampling of battery parameters like above, and everyone can join with
> the hunt for the better PM. Actually, something can be done even
> without Linux - exactly measuring how much juice is burnt in suspend
> by wince. If anyone will want to make such test, please charge the
> device fully, hard reset (important), and keep suspended exactly
> 24hrs, and report what battery meter will show.
>
> My device is in production use, so it will take some time before
> I'll be able to make this test myself ;-)
>
>
> --
> Best regards,
> Paul mailto:pmiscml_at_gmail.com
>
>
>
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> End of H4100-port Digest, Vol 36, Issue 6
> *****************************************
>
Received on Mon Jan 29 2007 - 23:19:22 EST