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

Tiago Marques tiagomnm at gmail.com
Thu Oct 15 13:35:16 EDT 2009

Submited as http://dev.laptop.org/ticket/9505

Best regards,
Tiago Marques

On Thu, Oct 15, 2009 at 3:47 PM, Ed McNierney <ed at laptop.org> wrote:
> Tiago -
> Thanks, please do put that into trac.
> Folks, in general it's time to start filling up trac.  If you find anything
> odd and it's not readily fixed through a quick inquiry, please open a trac
> ticket for it.  We're moving into the 1.5 endgame process and trac will be
> the main tool we'll use to know when we're done.  Please do not expect
> anyone to remember any problem you report if it's not in trac.  Thanks for
> all the help.
>        - Ed
> On Oct 15, 2009, at 10:37 AM, Tiago Marques wrote:
>> 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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