<p>The original USB cable supplied was faulty?? After I plugged it into another USB port just above it started to kick in but went ZOMBIE after a few seconds with USB Communication error??</p>

<p>I took another USB cable from my old 10xErupter Mega hub. Plugged it direct into the motherboard USB slot and U3 (also shorter cable).  <code>cgminer</code> started to do all kinds of weird settings until it settled down on <code>AU3</code>.</p>

<p>Using the official git, I compiled <code>cgminer</code> (This also works for Raspberry Pi)</p>

<pre><code>CFLAGS="-O2 -Wall -march=native" ./configure --enable-icarus
</code></pre>

<p><em>NOTE: Since version 4.9.0 you should not need to use any au3 switches</em></p>

<p>After that I set cgminer to <code>--au3-freq 238 --au3-volt 780</code> Allot of people say that when you go higher than 780 with the stock 6A power supply it melts in about 10 hours.</p>

<p>So when I get round to using my computer PSU I will clock these at 250/800 as recomended for best speed stability.</p>

<p><img src="https://i.sstatic.net/KgAf7.png" alt="enter image description here"></p>

CC BY-SA 3.0
2014-12-11T11:38:26.460Z
2015-01-06T20:00:21.920Z
2015-01-06T20:00:21.920Z
Piotr Kula
<p>How do I get the Bitmain U3 running on Linux?</p>

<p>I'm using Ubuntu Server 11.</p>

<p>I have downloaded the bitmain branch of cgminer and compiled it to using <code>CFLAGS="-O2 -Wall -march=native" ./configure --enable-bmsc</code> </p>

<p>I have also downlaoded the official 4.9.0 and used CFLAGS="-O2 -Wall -march=native" ./configure --enable-icarus` as described in the text for U3</p>

<p>I do a <code>lsusb</code> and it shows this:</p>

<p><img src="https://i.sstatic.net/gRDTj.png" alt="lsusb output"></p>

<p>cgminer just does this</p>

<p><img src="https://i.sstatic.net/fvaRi.png" alt="enter image description here"></p>

<p>Is there anything that I missed? I read that its supposed to pick up the U3 automatically with default settings, then I can over clock it a bit to get the 63ghs stable.</p>

<linux><antminer><u3>
How to get Bitmain U3 running on Linux?
Piotr Kula
# How to get Bitmain U3 running on Linux?

(Asked by: username_0 on 2014-12-11)

How do I get the Bitmain U3 running on Linux?

I'm using Ubuntu Server 11.

I have downloaded the bitmain branch of cgminer and compiled it to using `CFLAGS="-O2 -Wall -march=native" ./configure --enable-bmsc`

I have also downlaoded the official 4.9.0 and used CFLAGS="-O2 -Wall -march=native" ./configure --enable-icarus` as described in the text for U3

I do a `lsusb` and it shows this:

![lsusb output](https://i.sstatic.net/gRDTj.png)

cgminer just does this

![enter image description here](https://i.sstatic.net/fvaRi.png)

Is there anything that I missed? I read that its supposed to pick up the U3 automatically with default settings, then I can over clock it a bit to get the 63ghs stable.

**Tags:** linux, antminer, u3


---

## 1 answers

### Answer by username_0 on 2014-12-11. Score: 0 | Accepted answer

The original USB cable supplied was faulty?? After I plugged it into another USB port just above it started to kick in but went ZOMBIE after a few seconds with USB Communication error??

I took another USB cable from my old 10xErupter Mega hub. Plugged it direct into the motherboard USB slot and U3 (also shorter cable). `cgminer` started to do all kinds of weird settings until it settled down on `AU3`.

Using the official git, I compiled `cgminer` (This also works for Raspberry Pi)

```
CFLAGS="-O2 -Wall -march=native" ./configure --enable-icarus

```

*NOTE: Since version 4.9.0 you should not need to use any au3 switches*

After that I set cgminer to `--au3-freq 238 --au3-volt 780` Allot of people say that when you go higher than 780 with the stock 6A power supply it melts in about 10 hours.

So when I get round to using my computer PSU I will clock these at 250/800 as recomended for best speed stability.

![enter image description here](https://i.sstatic.net/KgAf7.png)


---

