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<base href="https://bugs.freedesktop.org/" />
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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 --- - [snb rc6] rc6 is not happening reliably"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59368">59368</a>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>[snb rc6] rc6 is not happening reliably
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Reporter</th>
<td>luto@mit.edu
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<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/Intel
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<th>Product</th>
<td>DRI
</td>
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<p>
<div>
<pre>This is probably related to <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [SNB] sysfs_rc6_residency test failed."
href="show_bug.cgi?id=51739">bug 51739</a> and <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [Bisected (sort of) SNB regression] rc6 never happening"
href="show_bug.cgi?id=53393">bug 53393</a>.
On my Lenovo X220s (Sandy bridge, 00:02.0 VGA compatible controller [0300]:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0126] (rev 09)), I often end up in full power mode, even when
idle at the gnome 3 desktop. I've seen this on Fedora 17 with various 3.6 and
3.7 kernels. i915_enable_rc6=7 has no effect.
When the problem is happening, i915_drpc_info looks like:
RC information accurate: yes
Video Turbo Mode: yes
HW control enabled: yes
SW control enabled: no
RC1e Enabled: no
RC6 Enabled: yes
Deep RC6 Enabled: no
Deepest RC6 Enabled: no
Current RC state: on
Core Power Down: no
RC6 "Locked to RPn" residency since boot: 0
RC6 residency since boot: 121924
RC6+ residency since boot: 0
RC6++ residency since boot: 0
sysfs_rc6_residency fails. The RC6 residency since boot: 121924 number doesn't
change at all, so presumably the chip is just stuck at full power instead of
flipping in and out of rc6.
The only strange kernel options I have are pcie_aspm=force
pcie_aspm.policy=powersave, which are mostly a relic from when the kernel
misinterpreted the BIOS lack of support for OS ASPM control.</pre>
</div>
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