monkeyboyted's suggestion to update the alsa driver fixed the crackling/garbled audio problem for me as well. I had the problem with a new Asus mobo (H97-plus) and new Intel processor:
from lspci: 00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06) 00:1b.0 Audio device: Intel Corporation Device 8ca0 and ubuntu 14.04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1300844 Title: No sound kernel 3.13 ALC887-VD but kernel 3.14 fixes it To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1300844/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs