[Bug 81662] [BYT Bisected]igt/kms_flip some subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81662

--- Comment #3 from lu hua <huax.lu at intel.com> ---
Test on latest -nightly kernel, the hang goes away.
 ./kms_flip --run-subtest 2x-absolute-wf_vblank
IGT-Version: 1.7-g4d2f511 (x86_64) (Linux:
3.17.0-rc1_drm-intel-nightly_257d90_20140822+ x86_64)
Using monotonic timestamps
Beginning 2x-absolute-wf_vblank on crtc 7:13, connector 28:16
  1366x768 60 1366 1404 1426 1482 768 771 777 798 0xa 0x48 71000
  1366x768 60 1366 1404 1426 1482 768 771 777 798 0xa 0x48 71000
.....................................................................................................................................................................................
2x-absolute-wf_vblank on crtc 7:13, connector 28:16: PASSED

Subtest 2x-absolute-wf_vblank: SUCCESS

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