Created attachment 97872 [details]
dmesg

System Environment:
--------------------------
Platform: HSW
kernel:   (drm-intel-next-queued) c79057922ed6c2c6df1214e6ab4414fea1b23db2

Bug detailed description:
----------------------------
Subcases mmap_cpu and page_flip_and_mmap_cpu of kms_fbc_crc fail on -nightly(35dc7c8af75a3e5ae52a5469786602ce083a6368) and -next-queued(c79057922ed6c2c6df1214e6ab4414fea1b23db2)

This bug always fail

output on -next-queued kernel:
 ./kms_fbc_crc --run-subtest page_flip_and_mmap_cpu
IGT-Version: 1.6-g78e4c2b (x86_64) (Linux: 3.14.0_drm-intel-next-queued_f68918_20140424+ x86_64)
Beginning page_flip_and_mmap_cpu on crtc 5, connector 13
Test assertion failure function test_crc, file kms_fbc_crc.c:316:
Last errno: 0, Success
Failed assertion: !igt_crc_equal(&crcs[0], &data->ref_crc[1])
Subtest page_flip_and_mmap_cpu: FAIL

Reproduce steps:
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1. ./kms_fbc_crc --run-subtest mmap_cpu
   or 
   ./kms_fbc_crc --run-subtest page_flip_and_mmap_cpu