Description of problem:

When initiating system shutdown (e.g. using "shutdown -h now" or "halt"), the system never powers down. If the "rhgb" kernel parameter is in use, the system will sit there with the Fedora logo on a blue background. If "rhgb" and "quiet" is removed from the kernel options, the last message from the kernel is «power down», and then it just sits there.

In order to actually power of the machine, the physical power button must be held pressed for 3-4 seconds.

Version-Release number of selected component (if applicable):

Fedora 15, kernel-2.6.38.6-27.fc15.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Issue the command "halt"
2. Wait while the shutdown procedure is done.
  
Actual results:

System goes through its entire shutdown procedure, but remains powered on.

Expected results:

The system should power down after the shutdown procedure has completed.

Additional info:

This has not been a problem before, it worked well in Fedora 14 and earlier.

Hardware profile: http://www.smolts.org/client/show/pub_81589bc8-9850-4802-8dea-a654e58c174d