user1151: I have an Ubuntu set up (11.10) and 2 ATI Radeon HD 6870 cards. It detects one, but not the other for some reason when I try to run poclbm. 
When I run lspci, it finds both cards.
Any help?

user1171: lspci lists PCI devices. ./poclbm.py lists OpenCL devices. If the former finds the device but the latter does not, your second GPU must not be registering as an OpenCL device.
Ubuntu 11.10 has a notorious reputation for multiple-GPU bugs. (See here and here.) I personally have had issues with 11.10 mining that were resolved simply by switching to another release. I would suggest you instead use Ubuntu 11.04 (Natty Narwhal); it is generally regarded to be the most reliable Ubuntu version for mining.
If that is not an option, or installing 11.04 doesn't fix the problem, try the following steps:

Uninstall whatever version of Catalyst/SDK you have (make sure to remove all configuration files) and install
Catalyst 11.6 and SDK 2.4.  
Run aticonfig -f --initial --adapter=all again. Make sure it runs without errors.
Run aticonfig --list-adapters. You should see two. 

Those steps should fix any configuration issues. If your problem persists, it's either a hardware issue (or an Ubuntu 11.10 issue).

1151: <p>I have an Ubuntu set up (11.10) and 2 ATI Radeon HD 6870 cards. It detects one, but not the other for some reason when I try to run <code>poclbm</code>. </p>

<p>When I run <code>lspci</code>, it finds both cards.</p>

<p>Any help?</p>
 1171: <p><code>lspci</code> lists PCI devices. <code>./poclbm.py</code> lists OpenCL devices. If the former finds the device but the latter does not, your second GPU must not be registering as an OpenCL device.</p>

<p>Ubuntu 11.10 has a notorious reputation for multiple-GPU bugs. (See <a href="https://bitcointalk.org/index.php?topic=53199.msg667050#msg667050" rel="nofollow">here</a> and <a href="https://bitcointalk.org/index.php?topic=50388.msg601325#msg601325" rel="nofollow">here</a>.) I personally have had issues with 11.10 mining that were resolved simply by switching to another release. I would suggest you instead use Ubuntu 11.04 (Natty Narwhal); it is generally regarded to be the most reliable Ubuntu version for mining.</p>

<p>If that is not an option, or installing 11.04 doesn't fix the problem, try the following steps:</p>

<ol>
<li>Uninstall whatever version of Catalyst/SDK you have (make sure to remove all configuration files) and install
Catalyst 11.6 and SDK 2.4.  </li>
<li>Run <code>aticonfig -f --initial --adapter=all</code> again. Make sure it runs without errors.</li>
<li>Run <code>aticonfig --list-adapters</code>. You should see two. </li>
</ol>

<p>Those steps should fix any configuration issues. If your problem persists, it's either a hardware issue (or an Ubuntu 11.10 issue).</p>
