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igt@kms_setmode@basic - fail - Failed assertion: fabs(mean - expected) < max(line_time(kmode), 1.718 * stddev)

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_6400/shard-snb7/igt@kms_setmode@basic@pipe-a-vga-1.html

Starting subtest: basic
Starting dynamic subtest: pipe-A-VGA-1
(kms_setmode:1498) CRITICAL: Test assertion failure function check_timings, file ../tests/kms_setmode.c:535:
(kms_setmode:1498) CRITICAL: Failed assertion: fabs(mean - expected) < max(line_time(kmode), 1.718 * stddev)
(kms_setmode:1498) CRITICAL: vblank interval differs from modeline! expected 16665.6us, measured 16717us +- 3.531us, difference 51.4us (14.6 sigma, 2.5 scanlines)
Dynamic subtest pipe-A-VGA-1 failed.
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