Enabled glitch-free, but unfortunately that had no effect and did not rectify the issue. I updated /etc/pulse/default.pa to ...
--- Start Snippet --- ### Automatically load driver modules depending on the hardware available .ifexists module-hal-detect.so #load-module module-hal-detect tsched=0 load-module module-hal-detect .else ### Alternatively use the static hardware detection module (for systems that ### lack HAL support) load-module module-detect .endif --- End Snippet ... and then rebooted. Still the same issue with logon sound and changing the sound stream whilst Rythmbox was playing to be through the usb sound. Change the sound stream back to laptop internal (Intel HDA) and within 2-3 seconds of doing so the usb sound stops crackling/popping. -- Loud and fast paced crackling/popping from snd_usb_audio https://bugs.launchpad.net/bugs/353787 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