Bug#764095: Works in 3.2.63, doesn't in 3.9 onwards

[Leonardo Boiko <leoboiko@gmail.com>]

So I forward-ported the wheezy 3.2 kernel package and confirmed that the sound works fine in it.

With the 3.9 package the sound disappears as described above, though without that "perf interrup" message.  The same goes for 3.10 and 3.14 (all kernels were from the Debian packages).