[Bug 480929] Re: [9.10]Audio hiss coming from netbook speakers when using headphones

[CarlT]

I’m having the same problem using 9.10 or the new 10.04 on an Acer
Aspire One and both versions cause the same hiss problem when headphones
are connected.

I followed the links posted by mastervivi and the information led me to
a fix for the problem.

The chipset of course is revealed by the head -n 1
/proc/asound/card0/codec* command will be Realtek ALC272.

Using the HD-Audio-Models.txt found here:
http://www.mjmwired.net/kernel/Documentation/sound/alsa/HD-Audio-
Models.txt

You will see a list of options to use for the options snd-had-intel
model=  line.

On the line 67, under the ALC267/268, the Acer Aspire One is listed, but
this is the wrong chipset.

On the line 92, under the ALC662/663/272, the ACER Aspire One is not
listed.

I tried the first two options with no real success.  Using one kills the
headphone but does solve the hiss issue.

I eventually tried “asus-mode1” in the options line and it appears to be
working properly now.

I have some more testing to see if the mic and recording abilities are
working properly.

I would be interested in any comment or feedback to see if this helps
others.

-- 
[9.10]Audio hiss coming from netbook speakers when using headphones
https://bugs.launchpad.net/bugs/480929
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