I hadn't realised it would be hardware-dependent. Mainly for reference in case other Mini 311 owners see this bug:
I tried editing the file /usr/lib/pm-utils/sleep.d/01PulseAudio (edited version is attached). It did resolve the muting issue, and didn't cause pops on suspend/resume, but it also made the boot time longer (by approx 7 seconds) and login time also seemed to be longer.
I hadn't realised it would be hardware-dependent. Mainly for reference in case other Mini 311 owners see this bug:
I tried editing the file /usr/lib/ pm-utils/ sleep.d/ 01PulseAudio (edited version is attached). It did resolve the muting issue, and didn't cause pops on suspend/resume, but it also made the boot time longer (by approx 7 seconds) and login time also seemed to be longer.