It looks like the culprit is debian/patches/63_improved_resampling.dpatch, after disabling this patches, the sound is normal again.
-- sound crackling with feisty libasound2 in some apps https://bugs.launchpad.net/bugs/97004 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
