I've recently encountered an interesting audio problem, using OS X with a Windows partition (via Boot Camp). Specifically, if the Windows partition is used, and then the computer is restarted into OS X, the sound no longer works in OS X. Once OS X has been restarted, the audio once again works. The audio always seems to work on the Windows side.
Further Clarification When the audio isn't working in OS X:
- the speaker icon in the menubar is grayed out
- if you go to Sound preferences, no output devices are available
- System Information, under the Audio tab, shows a list of outputs under "Devices", but nothing under "Intel High Definition Audio" (when functioning normally, after the OS X side has been restarted, there are a number of sub-options, including "Headphones", "Line Output", etc.)
Replication Scenarios causing audio loss:
Boot OS X : Audio works → Reboot OS X : Audio works → Repeat (Audio always works)
Boot Windows : Audio works → Reboot Windows : Audio works → Repeat (Audio always works)
Boot Windows : Audio works → Boot to OS X : Audio doesn't work → Reboot OS X : Audio works
Boot Windows : Audio works → Boot to OS X : Audio doesn't work → Boot to Windows : Audio works → Boot to OS X : Audio doesn't work
Relevant System Information
Mac Pro 4,1 Mac OS X 10.8.4 (12E55) Windows 8.1 (Preview)
I understand that Windows 8.1 isn't officially supported by Boot Camp and whatnot, but I'm actually kind of curious what is causing this to happen.