Topic: Strange behavior from antminer u2's (Read 908 times)

The 5 volt is disconnected from the port with the flash drive on it as well.

Ill look in to standby mode as well... but when you first power it up, it wont see them either.

Thanks for the replys however...


annoying... my wife was like "just leave the flash drive plugged in"...
I can't, knowing it isnt working the way I want irritates me :-)

If you replace the Flash drive with a USB powered fan will they work again. This would show that a hub port either needs to be grounded or that it at least needs a 5 volt load to function. You have completely removed both the 5v+ and 5v- leads from the hub to your devices and the hubs IC may think there is nothing plugged in to it and is in standby mode.

Hmm my guess is that the power saving functions are acting up. Try disabling power saving for the internal USB Ports.

I have set up a series of usb extension cables to draw power from a computer power supply. I wanted to overclock the antminer u2's I have
and I didnt have a hub that would power them. When I hook it all up, the red lights come on to show they are getting power. That's good.

The computer will not see them at all. Now for the odd part...

The computer will see a usb flash drive when plugged in, and I can access it just fine.

When I plug in the flash drive, all the antminers show up on the computer. I swapped out for the correct drivers, and
am running them with external cooling at --anu-freq 300 and they are all mining just fine. Some HW errors... but not too bad.

If I remove the flash drive, all the antminers will show up as ZOMBIE and will stop working.

so they will run for days when the flash drive is plugged in, but not without it...

I am a running a windows 7 laptop to run the antminers... running cgminer 4.3.5. All the antminers are plugged in to a 10 port usb hub as I said before. They are running on external power from a 350 watt power supply. The are being cooled by a few fans, and while running are slightly warm to the touch.

Anyone with any thoughts on this? Its making me crazy as I would like to get 5 more antminers to fill the hub, but can only use 4 if I have to have a drive plugged in all the time.

Thanks