Full-duplex fails on new Mac Pro
Background: the network port referred to below is 100/full-duplex/no autonegotiation. This is not changeable, sadly.
On a new (purchased May '09) Mac Pro, it refuses to accept the manual/100/full setting. It shows it as disconnected. Setting it back to "Automatic" brings up the connection, but only at 100/half with Ethernet collisions all over the place. It can also be set to manual/100/half and connect, but with the same Ethernet collision problems.
I can verify the port and cable are good; I can attach a white MacBook set to manual/100/full on that same port with the same cable without issue.
Has anyone else seen this behavior, and is there a resolution? Thanks.
Mac Pro early 2009, Mac OS X (10.5.7)