[Bug 208414] 10.3-RELEASE: *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208414

            Bug ID: 208414
           Summary: 10.3-RELEASE: *ERROR* Power management discrepancy:
                    GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was
                    1a000000
           Product: Base System
           Version: 10.3-BETA2
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mk at steepath.eu
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hi everyone,

After upgrading FreeBSD-10.1-RELEASE to FreeBSD-10.3-RELEASE on my Lenovo X220,
I have strange error with drm driver:

```
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 000d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 00000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
error: [drm:pid79738:gen6_sanitize_pm] *ERROR* Power management discrepancy:
GEN6_RP_INTERRUPT_LIMITS expected 1a0d0000, was 1a000000
```

This error come from the device drm, and the pid is X. Another consequence is a
big load and high temperature of my laptop (83°C) sometimes. I don't know if
its linked to this issue.

```
root                79738   0.6  0.2  152488  33260  -  S    12:33PM   0:20.07
/usr/local/bin/X -nolisten tcp vt09 -auth /var/run/slim.auth (Xorg)
```

Its seems others OS are impacted with this issue (linux). On FreeBSD this error
come from the file intel_pm.c not present in 10.1-RELEASE
(https://svnweb.freebsd.org/base/releng/10.3/sys/dev/drm2/i915/intel_pm.c?revision=296373&view=markup#l3572).

Some people have same issue on 10.2-RELEASE with same laptop. My kernel/world
were build from source:

```
FreeBSD localhost 10.3-RELEASE FreeBSD 10.3-RELEASE #0 r297394: Wed Mar 30
09:15:53 CEST 2016     root at eilidh.oci.re:/usr/obj/usr/src/sys/GENERIC  amd64
```

Thanks.

PS: 10.3-RELEASE is not in version field when I was created this bug report.

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