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Sun, 03 Jan 2010

/xHW/Thinkpad_a21m: More Sound Card Fun

In a previous post in this section[1] I noted that the Linux kernel no longer supports my Thinkpad A21M's sound card, and I have been using USB speakers instead. (Another post talks about a borked mother board, which turns out to have been not the case. More on that one another time.)

Suddenly out of the blue with the latest Debian 2.6.30 kernel I am getting something loading that is pretending to be a sound card and reporting itself to my mixer as a "PC Speaker". The problem with this is both Debian user-land and Linux applications make it difficult to switch from one sound card to another, either globally or per application, and everything defaults to the first sound card. Which spot is now being squatted upon by this useless "PC Speaker" thing, making it difficult for me to use the USB speakers.

This[2] appears to be the culprit: a "pcsp" module. And sure enough, lsmod tells me there is a snd_pcsp being loaded. So I added:

blacklist snd_pcsp

to /etc/modprobe.d/x-local-blacklist, rebooted, and it went away. Back to functioning USB speakers.

[1] http://blog.langex.net/index.cgi/xHW/Thinkpad_a21m/
[2] http://speech.braille.uwo.ca/pipermail/speakup/2007-August/044233.html

posted at: 14:39 | path: /xHW/Thinkpad_a21m | permanent link to this entry

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Sun, 03 Jan 2010