Hi, I have been working on the beaglebone since 1 year now and I had no issue since some days ago. I am using the BBB with a motherboard which among other thing is powering the BBB . The issue happens when I am first plugging the mini USB to a PC then plug the power from the motherboard. The symptoms are that the i2c busses 1 and 2 are timeouting when I am doing i2c request.Bus 0 is fine. If I do a i2cdetect -y -r 1 it takes about 2 secs poling each adress . The other symptom is that sometimes I loose ethernet over usb connection . I tried several BBB (rev B and C) with several motherboards and issue is still there. The other strange thing is that for now It happens only on 1 PC. Here again I tried different USB port with same behavior. I have read lots of messages from this group without finding anything close to my issue. The only similar issue I have found is here : http://stackoverflow.com/questions/29140579/beaglebone-black-stops-when-external-powered I tried the latest release debian 2015-03-01 and althought it seemed more stable than mine which is from april 2014 I am still experiencing the issue. So any idea or similar experience is welcomed ! Thanks,
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