powermac G5 fails to power off with 2.6.33.x and newer

hi all,
this powermac G5 ( PowerMac7,2 - dual 1.8 pci-x) fails to power off and just stops there and after a minute or so the fans start to roar. Reboot works fine.

Here my kernel config:
http://clinker.cruxppc.org/~acrux/config-2.6.33.5-powermacg5

thanks,
Nico

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