The sound support is not the only issue with suspending a client OS. Under Solaris (no sound support) any time my MacBook Pro suspends I have a complete freeze of the client and I am unable to exit Parallels -- beach ball cursor "forever". It is necessary to perform a Force Quit and restart the guest. Using a Linux guest, I have had the same experience.
Under Windows, I have not tried removing the sound support, but I will give it a try and report back.
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Update:
Removing the sound device from the virtual machine setup for Windows appears to have resolved the lock up issues. My Mac can now suspend without locking Parallels.
Removing the sound device from Linux (even though not in use) appears to have resolved the lockup issues.
Double checked Solaris setup and I do not have sound configured. Since I generally run it as one of multiple VM's, I'll check it as the only VM running and see if it stays stable.
Last edited: May 10, 2006