27 LED Cinema Display Audio and Brightness when powering MacBook Pro

When my 27 LED Cinema Display is powering my (or another) 2009 13" MacBook Pro, I have experienced three issues:
1. The dropped audio problem other users have mentioned. Shutdown, then disconnect power/usb/displayport, then wait ~15s, then reconnect and reboot temporarily fixes the problem.
2. I also have the sluggish keyboard behavior when adjusting the volume that others have mentioned.
3. I have experienced shifts in display brightness which are obvious when the display is dimmed. I have disabled the ambient light sensor as well as any interfering power management or energy saver settings. Opening apps, scrolling and other normal activities seem to aggravate this behavior.
This last strange behavior inspired me to try using a power adapter for the MacBook Pro instead of display's laptop power connector. *Doing so seems to have resolved all three issues.*
It seems that this may indicate an underlying problem with the display's power supply. Can anyone confirm?

mmayo wrote:
I am having the same issues & with a 1 day old display. I am using a 15" MBP. The screen is killing me when it dims down when no lights are on. I didn't notice the issue when the screen is brighter with the lights on. Anyone know if this is a hardware or software issue? I'd like to utilize the ambient light sensor but not if its going to make my screen flicker when it is dim....
(1) I have never had any deaths associated with my screen, but on rare occasions my display's brightness will flicker when I manually adjust the brightness. The fix I have found for this is to increase the brightness one more setting or decrease it one more setting. Changing the screen from full dim to full bright and then setting the brightness I want sometimes helps, too.
(2) You can check whether this software update has been applied to your 27-inch:
  http://support.apple.com/kb/HT4293
(3) Your Apple Service Provider could tell you whether your problem is related to hardware or software.
Mac Pro Quad Core (Early 2009) 2.93Ghz Mac OS X (10.6.4); MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.4)
LED Cinema Display; G4 PowerBook 1.67GHz (10.4.11); iBookSE 366MHz (10.3.9); External iSight; iPod touch 4.1

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