I have a similar problem, but not with HDMI. The bug I submitted may be
a duplicate, but I don't think so:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1190700

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https://bugs.launchpad.net/bugs/1174696

Title:
  Regression in sound quality on 13.04 as compared to 12.04 (HDMI over
  DP) on Thinkpad W510

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