On 2/5/2013 10:44 AM, CeDeROM wrote: > On Tue, Feb 5, 2013 at 5:27 PM, <chr...@ultimatedns.net> wrote: >> Understood. I was referring to the _computers_ power supply. :) > Still it may be caused by some issued on the USB bus power management. > Normally an USB port can supply 500mA of current. Above that port > should be disabled by the host if I remember correctly. If there is a > hub inside the serial port adapter it would be good to know it it is > powered directly from the USB port or does it have its own power > supply... > > There could be too much power drain from the USB port by external > devices attached to the hub/adapter. But this would be rather obvious. > > There may be some misunderstanding between USB Host and the self > powered USB device, so they cannot agree on the power supply level, > which seems more probable :-) The FTDI adapter has the provision for an external power supply (+5V) but it does not require it unless you're running off an unpowered bus, which is not normally the case. 500ma is quite a bit of available energy.
I suspect the issue is found in the KVM, which attaches as a "low" speed device; I'm going to see if I have the same issue with other USB devices connected while the KVM is on the box. -- -- Karl Denninger /The Market Ticker ®/ <http://market-ticker.org> Cuda Systems LLC _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"