Alsa problem with Via 8235

I having trouble with the my Via 8235 chipset and the latest kernel.

Sound works sometimes for a minute or so, but most of the time I just get a lot of random noise (hissing/crackling etc)rather than any audio.

I noticed I'm getting the following error in dsmseg:

via82xx: Assuming DXS channels with 48k fixed sample rate. Please try dxs_support=1 option and report if it works on your machine.

I tried adding a dxs_support=1 option in modules.conf, but it made no difference to the sound problem.

I've also tried playing around with the mixer settings, but no matter what I set them to I still get the same problem.

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