I have been helping a few people on #alsa on freenode.net.
Some points to note: -
1) It seems that alsa does not work when compiled into the kernel, but does work as modules.
2) For alsa to work in kernel 2.6, the first item in the OSS menu has to be set to M, otherwise module soundcore does not seem to exist. (This is unconfirmed, so might just be user error)
3) It would be nice if there was a test tool.
This test tool would test for: -
a) See if the user has loaded the kernel modules, so that a "card" exists in /proc/asound.
b) Test the mixer interface is functioning.
c) Display alsa-driver, and alsa-lib version numbers.
d) check access writes to /dev/snd/* are valid from the currently logged in user.
e) check /etc/modules.conf contains all the correct alias statements, to ensure the sound modules will load up again after a reboot.
f) check /etc/modules.conf is not still trying to load OSS drivers.
g) Make a simple test, by playing some white noise out of each speaker in turn, allowing for up to 6 speakers. Let the test go in a loop, so that the user can adjust mixer settings until they hear sound.
h) Provide some test so that alsa-lib can detect if interrupts are actually reaching the sound card or not. Some bugs in ACPI might mean that interrupts are not forwarded correctly.
After these tests, it could produce a nice simple message, telling the user what to do next to fix it.
Cheers James
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