Linux custard 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 15:59:53 UTC 2012 i686 athlon i386 GNU/Linux
When shutdown this previous kernel correctly powers down the USB ports. So, it looks like the quirk for the 590 chipset is still needed. Is there anything I can test for you?
The last kernel running on this machine was:
Linux custard 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 15:59:53 UTC 2012 i686 athlon i386 GNU/Linux
When shutdown this previous kernel correctly powers down the USB ports. So, it looks like the quirk for the 590 chipset is still needed. Is there anything I can test for you?