i've made some tests with ubuntu kernel working kernel : linux-image-2.6.32-24-virtual freezing kernel : linux-image-2.6.32-25-virtual don't know if it's related (maybe a patch on 2.6.32-25 ubuntu kernel is also apply to debian kernel ? ) i'll try with others 2.6.32 debian kernels version, to see if i can made one to work.