Latest LQ Deal: Latest LQ Deals
Go Back > Forums > Linux Forums > Linux - Hardware
User Name
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


  Search this Thread
Old 10-16-2005, 10:53 AM   #1
Registered: Dec 2004
Location: Sweden
Distribution: Slackware
Posts: 30

Rep: Reputation: 15
Microphone issues on Intel integrated audio

Problem: I have two microphone inputs, one (front) works while the other (rear, prefered) doesn't, and I can't get either to playback directly. I really need this, because my TV card uses the audio card's mic for sound.

The computer is a Dell Dimension 5100 (pretty new) with integrated sound card:
* Chipset: Intel 945G Express
* Audio: Inte High Definition Audio
*** lspci: 00:1b.0 Class 0403: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
*** alsamixer: Card: HDA Intel, Chip: SigmaTel STAC9221 A1
* Slackware 10.2 / Kernel (compiled with ALSA, no OSS)
* It has a "rear mic" on the back together with the other connectors, and also front mic and headphone connectors.

AlsaMixer has the following controls:
* Playback:
*** PCM
*** Front
*** Surround
*** Center
*** LFE (can unmute and change it, but it always resets. What is "LFE"?)
*** Channel: 2ch or 6ch (I have it on 2ch)
*** Input Source: "Mic", "Front Mic" or "Line"
* Capture
*** Capture (set on 100%)
*** Mux (set on 100%)

I can record and replay (eg using Krec) with the front mic if I set the Input Source to that, but not with the rear mic.

Thus I have two problems:
* Get the "rear mic" to work at all
* Get either mic to play directly to the speakers. I've never had any trouble before doing this before.

One observation that might relate to the rear mic. I booted up Windows, and noticed that when I poped in a mic in the rear, Windows poped up a window asking me if I had inserted a microphone, and only when confirming that, was it enabled. So there may be some subtle switch that must be enabled for it to work. Nothing similar with the front mic, though.

All ALSA modules seems loaded ok, and sound works good otherwise.

Excerpt from amixer:
Simple mixer control 'LFE',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 127
  Mono: Playback 0 [0%] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 14
  Front Left: Capture 14 [100%] [on]
  Front Right: Capture 14 [100%] [on]
Simple mixer control 'Channel Mode',0
Simple mixer control 'Input Source',0
Simple mixer control 'Mux',0
  Capabilities: cvolume
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 4
  Front Left: Capture 4 [100%]
  Front Right: Capture 4 [100%]
Again, I do not know what LFE stands for. And, those "Channel Mode" and "Input Source" looks weird, but there seems to be no way of changing that.

Any help with these problems are greatly appriciated!
Old 10-18-2005, 03:27 PM   #2
Registered: Dec 2004
Location: Sweden
Distribution: Slackware
Posts: 30

Original Poster
Rep: Reputation: 15
*** bump ***

Any ideas at all?


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
AC 97 Integrated Audio Caluka Linux - Hardware 9 08-14-2005 08:01 AM
Philips Usb Webcam - Microphone Integrated pingouinux Linux - Hardware 4 08-02-2004 05:07 PM
AC 97 integrated audio Obscure Linux - Newbie 15 04-16-2004 11:55 AM
RH 7.2 and Integrated Audio linuxchick Linux - Newbie 3 09-18-2002 07:48 PM
Linux net driver for Intel D815EFV integrated mobo (Intel PRO/100 VE) bikermagi Linux - Networking 0 05-07-2002 02:51 PM > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 08:08 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration