[linux-audio-user] loopback with hda-intel

Patrick Shirkey pshirkey at boosthardware.com
Mon Jun 19 12:34:30 EDT 2006

Mark Knecht wrote:
> On 6/19/06, yvan chenard <mte_multi at hotmail.com> wrote:
>> Hi, maybe someone can help me,
>> I find no ways to route (loop_back) the Line-in(where I have my tv-tuner
>> pluged in) to
>> the headphone jack, maybe someone know how to do it or know any links on
>> documentation on how to do it.
>> The sound card is onboard Intel D945GTP
>> the chipset is STAC9220 (from sigmatel) (HDA_intel compatible)
>> I am runing ALSA 1.0.11 not in the kernel(as module).
>> kernel
>> The only way to get sound from LineIn to HeadPhone right now is
>> "cat /dev/dsp > /dev/audio", but the quality is realy bad( with this
>> command I know that the configuration of the input and output is OK).
>> Thank You for your time.
>> Yvan
> Sort of overkill for the application but possibly run Jack and then
> use QJackCtl to do your required connections?
> Good luck,
> Mark

The problem shouldn't be happening. The driver for the intel8x0 should 
automagically route the signal from line to master out. If you run 
alsamixer there might be a capture switch toggle to set or it could be a 
driver bug.

What programs/mixers other than "cat" have you tried?


Patrick Shirkey - Boost Hardware Ltd.
Http://lau.linuxaudio.org - The Linux Audio Users guide

"Anything your mind can see you can manifest physically, then it will 
become reality" - Macka B

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