I have the same problem, and I believe the cause is this bug. I am on an Acer Aspire 4535, and the sound card is a realtek alc888, with a clean install of Ubuntu 10.04 64bit.
I have the same problem, and I believe the cause is this bug. I am on an Acer Aspire 4535, and the sound card is a realtek alc888, with a clean install of Ubuntu 10.04 64bit.