published on: mingster

If your bootcamp windows is having very poor volume output on 2009 unibody MacBook Pro, here's the solution: Thank you, Henry.

I follow the instruction below, plus a reboot, and fixed the problem:

  1. Download and unzip this package: (Nov. 1, 2009).
  2. In Device Manager, Update Driver for the Cirrus Logic High Definition Audio device. Don't let Windows search for or do anything automatically. Manually choose to the driver from a list, and use the "Have Disk..." button.
  3. Reboot.

My configuration is latest 13" MBP (MB990LL/A), bootcamp 3.0 from Snow Leopard, and latest Windows 7 (build 7600).

The detail discussion can be viewed here: