Nonsensical jack sensing - A bug day idea

Zachary Powers zpowers at
Fri Feb 20 15:31:40 UTC 2009

On Fri, Feb 20, 2009 at 8:42 AM, Philip Wyett <philwyett at> wrote:

> Hi all,
> Users of Linux with ALSA on laptops and other mobile devices have for
> years often been presented with the fun and games of sound working great
> but then plugging in headphones leaves you with no sound or sound coming
> out of speakers and headphones etc. This annoys many and makes distros
> look poor to the new user in some cases. Could we have a bug day for and
> in conjunction with ALSA to collect as much per user hardware and what
> they set to fix it i.e. the 'options' in alsa-base to maybe allow the
> ALSA project to make things better for all.
> Your thoughts would be appreciated?
> Regards
> Phil
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HI Phil,

It is my understanding that ALSA issues, like the ones you describe above,
originate mostly from one single driver, the driver for Intel HDA cards. Is
it the fact that the driver has difficulty detecting the audio card's
sub-model(sub-models are the vendor specific versions of these audio cards
that have changes made to them by the OEM) that many of these issues happen.
The way the driver is designed is that it uses the BIOS to automaticly
detect the sub-model, but many OEMs do not specify the sub-model in the BIOS
like they should.

Perhaps there is some other method this driver can use to try to detect the
Intel card's sub-model?
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