|
This is a pair of questions I posed a few weeks ago, although I didn't
get any response. I tried to work round it by switching to OSS4, but it
is too buggy to be usable on my hardware, so it looks like I'll need to
ask the same questions again unfortunately. The questions, which I shall explain in more detail in moment, are: 1. How can I enable the internal microphone on my machine? 2. How can I lower the mic input volume? I have a an 82801H chipset (Conexant CX20549) on my Thinkpad R61i. The machine has an internal mic and a mic socket. When I use a mixer such as Kmix, I find that the toggling to ExtMic silences both the internal and external mics. Toggling to IntMic enables the mic socket, but leaves the internal mic silent. On top of this, when the external mic is enabled, it is fixed at what sounds like maximum input volume, which means that the sound is very badly clipped and not at all usable for VOIP or anything else. In the past I was able to make VOIP calls using the mic socket. Most of these were through a very low quality headset which I no longer have, and which probably produced a weaker signal, but the last calls that I was able to make successfully used the same headset that I am using now. I suppose it's possible that I just didn't notice the distortion and that my kids at the other end of the line simply didn't complain, but I did make Skype test calls, so I find it hard to imagine how I could have missed it. Nothing significant changed on my system between the time in the period during which the distortion appeared, no kernel upgrades or software updates. It is as if there is a setting which ALSA does not present to mixers, but which can nonetheless be changed. I'm very puzzled. I have tried using more recent ALSAs (1.0.20 and 1.0.21, but these only bring in additional bugs without solving the problem). I first noticed the problem on a 2.6.30-rc6 kernel and I am now running 2.6.31-rt9. So, to repeat the questions: 1. How can I enable the internal mic on Thinkpad? 2. How can I lower the input volume level (external or internal mic) so that the sound stops clipping? And I have a third question: 3. if there isn't currently an answer to this two questions, what are the prospects of these problems being solved in the recently near future? I need to decide whether to continue using Linux or whether to go back to what everyone else is using. Many thanks Robert |
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