I solved the noise problem by editing /etc/pulse/default.pa. I replaced the line load-module module-hal-detect tsched=0 with load-module module-hal-detect and the noise (crackling) was gone.
-- noise (crackling) when muting PCM volume and audio is playing https://bugs.launchpad.net/bugs/272321 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
