[Bug 59368] New: [snb rc6] rc6 is not happening reliably

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59368

          Priority: medium
            Bug ID: 59368
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [snb rc6] rc6 is not happening reliably
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: luto at mit.edu
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

This is probably related to bug 51739 and bug 53393.

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.

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