em(4) on FreeBSD is sometimes annoying

Jack Vogel jfvogel at gmail.com
Fri Aug 8 18:31:28 UTC 2008

OK, I just got access to a machine, am going to install and see if I
can repro this
this afternoon.


On Fri, Aug 8, 2008 at 10:56 AM, Markus Vervier <markus at vervier.info> wrote:
> Jack Vogel schrieb:
>> "me too" 's are of little help. Please elaborate on your "exact same",
>>  since
>> each person's perception will be slightly different.
> Hi Jack,
> maybe read it like: Thinkpad X60 1706GMG affected too, so the problem is not
> specific to Martins machine.
> I can write the same steps to reproduce the behaviour as Martin here:
> <-->
> Once again, steps to reproduce this behavior:
> 1) Power the laptop OFF. Really OFF, I mean. No reboots!
> 2) Detach the cable from NIC.
> 3) Boot FreeBSD. Let it pass the DHCP phase (ifconfig_em0="DHCP") until
> login appears.
> 4) Attach the cable to the NIC.
> 5) Voila... no link.
> <-->
> My perception is that if the em driver gets loaded without a cable being
> plugged in, no link can be established.
> I can workaround the problem when em was not build into the kernel, by
> unloading the em-kmod and reloading it
> again with the cable plugged in. If the cable is not plugged in the
> interface will always stay in state "no carrier".
> The NIC works fine under Windows / Linux on the same machine.
> --
> Markus
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