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So I've got a strange problem that I've been running onto. I've got a bitcoin usb miner, Bitfury, and I'm using CGMiner to mine.

When I start the application, as root, the USB device is not detected automatically. CGMiner only detects the stick when it's re-plugged (it detects an hotplug event, and then works as intended)

I'd like to set up a headless mini-server, and therefore, I'd rather not stand up and unplug and then replug the device everytime the servers restarts, as I'm too lazy for that, and it's somewhat difficult do to when I'm not physically at my home.

So, is it possible to, like, turn off the USB system and restart it? Or is there a better way to do it?

Currently, I'm running Fedora 20 on HP t5730 terminal, but I've encountered the problem on Raspbian on Raspberry PI, so I don't think it's something OS-side. Maybe it's the device itself, or CGMiner's fault, but I was yet unable to find anything on that topic.

  • I'm wondering if a udevadm command could "trigger/simulate" the hotplug event. – rickhg12hs Mar 30 '14 at 22:38
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Unload your USB HCI kernel modules (anything *hci_hcd and *usb*) and reload them. This is the only reliable way to actually cut the power to the USB ports.

There are other less severe method to achieve the same thing, but they are not guaranteed to work depending on how your device fails.

  • Strange, there are no hci or usb modules loaded when lsmod'ding (except usb-storage). – user63936 Mar 30 '14 at 21:05
  • It's most likely because it's compiled built-in. The alternative is a bit cumbersome, as you need to unbind all usb devices/hubs from their driver and rebind them. And it's not as reliable; I managed to crash machines while doing this. – BatchyX Mar 30 '14 at 21:09

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