[Bug 83177] [BDW Regression]igt/=?UTF-8?Q?pm=5Frpm=20some=20subcases=20cause=20=E2=80=9CWARNING?=: CPU: 0 PID: 4578 at drivers/gpu/drm/i915/intel_display.c:1294 hsw_disable_ips+0x2d/0x15a [i915]() ”

Wed Sep 17 00:54:14 PDT 2014

https://bugs.freedesktop.org/show_bug.cgi?id=83177

--- Comment #6 from Guo Jinxian <jinxianx.guo at intel.com> ---
The dmesg error is able to reproduce on latest
-nightly(a2ca46441decdcdf4010f1db8a7041c8851327b3)n while running tests below

igt/kms_flip/vblank-vs-modeset-suspend
igt/kms_flip/vblank-vs-modeset-suspend-interruptible

root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest vblank-vs-modeset-suspend-interruptible
IGT-Version: 1.8-g137877f (x86_64) (Linux:
3.17.0-rc2_drm-intel-next-queued_a2ca46_20140909+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:44:24 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:44:56 2014

vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:45:28 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:46:00 2014

vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:46:30 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 17 19:47:02 2014

vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19: PASSED

Subtest vblank-vs-modeset-suspend-interruptible: SUCCESS (10.733s)
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm                  <3>[  655.105654]
[drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register detected. Please use
the i915.mmio_debug=1 to debug this problem.
<3>[  656.892202] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  658.714766] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  660.469291] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  662.486959] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  664.230482] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.

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