Description of problem:

When shutting down the system, power off is called but not honored for the
kernel-2.6.25-0.121.rc5.git4.fc9.i686 version. Previous 2.6.25 kernels released
do power off correctly. I am currently running the last working version,
kernel-2.6.25-0.113.rc5.git2.fc9.i686

Version-Release number of selected component (if applicable):
kernel-2.6.25-0.121.rc5.git4.fc9.i686

How reproducible:
Install initially, then remove and install with a newer version of mkinitrd and
kernel shell. Current version of mkinitrd is mkinitrd-6.0.39-1.fc9.i386.
Current version of nash is nash-6.0.39-1.fc9.i386

Steps to Reproduce:
1. Boot system
2. shut down via GNOME GUI or with poweroff
3. hold down power button since system does not power off
  
Actual results:

Neither poweroff of a GUI shutdown gets past the call to poweroff. Nothing shuts
down system except holding down the power button for several seconds.

Expected results:

System shuts down as before this kernel version.

Additional info:
lspci -vvv atached