Can not change sound volume on Macbook Pro using headphones

Bug #102460 reported by Mike Basinger
This bug report is a duplicate of:  Bug #102818: macbook volume control doesn't work. Edit Remove
2
Affects Status Importance Assigned to Milestone
Ubuntu
New
Undecided
Unassigned

Bug Description

You can not the Master volume on a Macbook Pro if you have headphones plugged in. The sound level will change if you are only using the built-in speakers. I'm running Feisty 7.04 beta on the following system:
 Machine Name: MacBook Pro 15"
  Machine Model: MacBookPro1,1
  Processor Name: Intel Core Duo
  Processor Speed: 2 GHz
  Number Of Processors: 1
  Total Number Of Cores: 2
  L2 Cache (per processor): 2 MB
  Memory: 1.5 GB
  Bus Speed: 667 MHz

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