Sound not working on 2.6 kernel

[Thiago Vinhas de Moraes]

Hi.

I've downloaded the 2.6-test4 rpm from RedHat, and now the sound just
doesn't work on KDE.
I tried to run the redhat-config-sound, it detected the sound card and I
could hear the music it plays, but when I log in to KDE, I get the
following message:

Sound server informational message:

Error while initializing the sound driver:

device /dev/dsp can't be opened (No such device)
The sound server will continue, using the null output device.

Any idea of how to fix this?

Regards,
Thiago