[Bug 71656] New: [SNB] CPU is running hot with kernel 3.12.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71656

          Priority: medium
            Bug ID: 71656
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB] CPU is running hot with kernel 3.12.0
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: erik at vontaene.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 89278
  --> https://bugs.freedesktop.org/attachment.cgi?id=89278&action=edit
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)

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