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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - vgaswitcheroo crashes when passing "OFF" to the "switch" file"
href="https://bugs.freedesktop.org/show_bug.cgi?id=69365">69365</a>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>vgaswitcheroo crashes when passing "OFF" to the "switch" file
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lbdkmjdf@sharklasers.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>DRM/Radeon
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
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<pre>I have an HP laptop with dual AMD graphics cards (radeon HD 6520g + HD 6750M)
running Ubuntu 13.10 beta1, kernel 3.11.0-7-generic amd64.
This command
# echo "OFF" > /sys/kernel/debug/vgaswitcheroo/switch
throws a WARNING in the kernel logs, after which the folder
/sys/kernel/debug/vgaswitcheroo/ and the dGPU disappear (as noted in the logs)
(and power usage is notably lowered, guessing from the temperatures).
dmesg: <a href="http://pastebin.com/Pb7ELyqP">http://pastebin.com/Pb7ELyqP</a> , lines 1196+
Someone else in the #radeon channel also found this report:
<a href="http://lists.freedesktop.org/archives/dri-devel/2013-September/045157.html">http://lists.freedesktop.org/archives/dri-devel/2013-September/045157.html</a>
which links to another old report from the same person.
Thanks.</pre>
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