<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [SNB] CPU is running hot with kernel 3.12.0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71656">71656</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SNB] CPU is running hot with kernel 3.12.0
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>erik@vontaene.de
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=89278" name="attach_89278" title="Turbostat output, System is idle in the last two stats">attachment 89278</a> <a href="attachment.cgi?id=89278&action=edit" title="Turbostat output, System is idle in the last two stats">[details]</a></span>
Turbostat output, System is idle in the last two stats
Hi,
With kernel 3.12 my Sandybridge Laptop (Lenovo T420) gets easily heated up.
As soon as I start openarena the CPU reaches ~96°C and stays there. It won't
cool down, even when idle. The only way to cool the system down is a reboot or
suspend to ram.
A bisect between Linux 3.11 and 3.12 identified
351aa5666d02062b52329bcfe4bcf9d1f882fba9 (drm/i915: tune the RC6 threshold for
stability) as bad commit. Indeed reverting this commit on 3.12 fixes the
problem.
I have attached the turbostat output.
The CPU is Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz.
Graphic is
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>