XO-1.5 A1 HDA issues

John Watlington wad at laptop.org
Wed Jul 1 10:18:27 EDT 2009

On Jul 1, 2009, at 8:16 AM, James Cameron wrote:

> G'day Daniel,
> While you're in the code, consider the possibility of headphone socket
> electrical damage rendering the headphone detection incorrect.

The jack insertion circuitry is mandated, if you want to stay
compatible with generic HD drivers, so I'm sure this issue
can arise...

The good news is that, unlike XO-1, the headphone detect
and speaker mute function is completely implemented in
software, allowing such hacks.


> I was in the HDA conexant driver late last year creating a hack to
> compensate for a system that was damaged ...
> http://quozl.linux.org.au/2008-12-19-hp-present/
> If the headphone detection feature could be accessed from user space,
> this hack would have been unnecessary.  I don't know how likely this
> problem will be on XO 1.5 ... but if analog input is still an option
> there may be a way for the kiddies to break things.
> A hack like this could change a "no audio from speakers" laptop into a
> "speakers do not turn off when headphones used" laptop ... reducing  
> the
> need for a return or replacement.
> -- 
> James Cameron    mailto:quozl at us.netrek.org     http:// 
> quozl.netrek.org/
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