XO-1 Build 802 doesn't turn off speaker amplifier

Tiago Marques tiagomnm at gmail.com
Thu Oct 15 10:37:57 EDT 2009


Thanks for looking into it. I didn't had to place my hear next to the
speaker, I noticed noise coming out one day while working on it late
at night. The lack of ambient noise made it pop out.
So... 120 to 360mW. Seems worth pursuing. Should I submit the trac ticket?

Best regards,
Tiago Marques

On Thu, Oct 15, 2009 at 2:35 AM, James Cameron <quozl at laptop.org> wrote:
> On Sat, Oct 10, 2009 at 11:00:29PM +0100, Tiago Marques wrote:
>> As anyone ever measured this?
>
> I've just measured it now.
>
> Unfortunately my meter lacks accuracy on this range, but in two tests,
> with or without backlight, without any battery, I saw a 20mA (+/- 10mA)
> improvement as a result of disabling the amplifier with alsamixer.  The
> hiss from the speakers also went away.  (I had to place my ears within a
> few inches to be able to hear the change).  The input voltage 12.06V.
>
> There was no change to the current consumed during suspend.
>
> --
> James Cameron
> http://quozl.linux.org.au/
>


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