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

Ed McNierney ed at laptop.org
Thu Oct 15 10:47:50 EDT 2009

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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