"em" driver shuts down interface when "ifconfig media 100baseTX" is invoked


FreeBSD cg-gw 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #10: Tue Jan 16 01:40:27 EST 2007 root@taint:/usr/obj/usr/src/sys/FW-YQ i386


I did:
"ifconfig em2 media 100baseTX mediaopt full-duplex"

ifconfig em2 now reports:
...
media: Ethernet 100baseTX <full-duplex> (autoselect)
status: no carrier

"ifconfig em2 media 100baseTX" also does this


We tried it on 2 different 100baseTX interfaces with the same result

"ifconfig em2 media autonegotiate" brings the interface back up


It doesn't seem to happen on another interface which autonegotiates
10baseT half-duplex, however


This seems to indicate there might be a driver problem since
the 2 interfaces connect to very different kinds of equipment


Any suggestions?

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