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igt@kms_frontbuffer_tracking@fbc* - fail - Test assertion failure function do_status_assertions, Failed assertion: intel_fbc_is_enabled(drm.fd, prim_mode_params.pipe, IGT_LOG_WARN), FBC disabled

http://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1546163300?query_key=b591e0f5a212153f2afb55428392c1056b1c3d88

Stdout	
Opened device: /dev/dri/card0
FBC last action not supported
Can't test PSR: no usable eDP screen.
Can't test DRRS: no usable screen.
Starting subtest: fbc-1p-primscrn-pri-indfb-draw-mmap-wc
Stack trace:
  #0 ../../../usr/src/igt-gpu-tools/lib/igt_core.c:1988 __igt_fail_assert()
  #1 ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:1552 __do_assertions()
  #2 ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:1832 prepare_subtest_screens()
  #3 ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:2719 draw_subtest()
  #4 ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:5275 __igt_unique____real_main5243()
  #5 ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:5243 main()
  #6 ../csu/libc-start.c:342 __libc_start_main()
  #7 [_start+0x2e]
Subtest fbc-1p-primscrn-pri-indfb-draw-mmap-wc: FAIL (14.757s)

Stderr	
Starting subtest: fbc-1p-primscrn-pri-indfb-draw-mmap-wc
(kms_frontbuffer_tracking:1219) i915/intel_fbc-WARNING: fbc_is_enabled():
FBC disabled: stride not supported
  [PLANE:31:plane 1A]: stride not supported



(kms_frontbuffer_tracking:1219) CRITICAL: Test assertion failure function do_status_assertions, file ../../../usr/src/igt-gpu-tools/tests/i915/kms_frontbuffer_tracking.c:1552:
(kms_frontbuffer_tracking:1219) CRITICAL: Failed assertion: intel_fbc_is_enabled(drm.fd, prim_mode_params.pipe, IGT_LOG_WARN)
(kms_frontbuffer_tracking:1219) CRITICAL: FBC disabled
Subtest fbc-1p-primscrn-pri-indfb-draw-mmap-wc failed.
**** DEBUG ****
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
(kms_frontbuffer_tracking:1219) i915/intel_fbc-DEBUG: Test requirement passed: dir >= 0
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