igt@kms_vblank@accuracy-idle* - fail - Test assertion failure function accuracy, Failed assertion: vbl.reply.sequence == target

http://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1743595171?query_key=b20a4861b4699a46b0c2a8e829be8a59c157a133

Starting dynamic subtest: pipe-C-eDP-1
(kms_vblank:1109) CRITICAL: Test assertion failure function accuracy, file ../../../usr/src/igt-gpu-tools/tests/kms_vblank.c:332:
(kms_vblank:1109) CRITICAL: Failed assertion: vbl.reply.sequence == target
(kms_vblank:1109) CRITICAL: error: 1797 != 1788
Dynamic subtest pipe-C-eDP-1 failed.