[Bug 200712] log spamming i915 since recent MFC to stable/10

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200712

            Bug ID: 200712
           Summary: log spamming i915 since recent MFC to stable/10
           Product: Base System
           Version: 10.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: riggs at FreeBSD.org

Since a recent update of a stable/10 workstation to a post-r282199 kernel, I
observe log spamming wrt i915 drm:

[...]
Jun  8 18:39:59 marvin2011 kernel: error: [drm:pid24:i915_gem_object_unbind]
*ERROR* Attempting to unbind pinned buffer
Jun  8 18:39:59 marvin2011 last message repeated 20 times
Jun  8 18:40:13 marvin2011 kernel: error: [drm:pid1323:gen6_sanitize_pm]
*ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected
190d0000, was 19000000
Jun  8 18:41:51 marvin2011 kernel: error: [drm:pid1323:gen6_sanitize_pm]
*ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected
190d0000, was 19000000
Jun  8 18:41:56 marvin2011 kernel: error: [drm:pid1323:gen6_sanitize_pm]
*ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected
190d0000, was 19000000
Jun  8 18:42:51 marvin2011 kernel: error: [drm:pid24:i915_gem_object_unbind]
*ERROR* Attempting to unbind pinned buffer
Jun  8 18:43:29 marvin2011 last message repeated 21 times
Jun  8 18:43:29 marvin2011 last message repeated 21 times
Jun  8 18:44:14 marvin2011 kernel: error: [drm:pid1323:gen6_sanitize_pm]
*ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected
190d0000, was 19000000
Jun  8 18:44:21 marvin2011 kernel: error: [drm:pid1323:gen6_sanitize_pm]
*ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected
190d0000, was 19000000
[...]

The CPU/GPU in this system is a:

CPU: Intel(R) Xeon(R) CPU E31260L @ 2.40GHz (2400.08-MHz K8-class CPU)
Origin="GenuineIntel"  Id=0x206a7  Family=0x6  Model=0x2a  Stepping=7
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x1fbae3ff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX>
AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
AMD Features2=0x1<LAHF>
XSAVE Features=0x1<XSAVEOPT>
VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
TSC: P-state invariant, performance statistics

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