In case anyone else has this issue, I'm happy to report that Update 2 has fixed all passthrough issues for X58/ICH10. I didn't have to do anything special - or more specifically, anything differe...
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In case anyone else has this issue, I'm happy to report that Update 2 has fixed all passthrough issues for X58/ICH10. I didn't have to do anything special - or more specifically, anything different from 5.1. I just clean installed 5.5U2 from the ISO (with all SATA cables physically disconnected, of course...), (re)configured DirectPath I/O and datastores, fired up the VM, and everything worked as expected - for a change. Let's just hope future releases (5.5U3? 6.0?) don't break everything again...