[Bug 99912] [IGT] kms_setmode at basic test fails vblank accuracy (18.018us, 0.1%) worse than a scanline

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99912

--- Comment #35 from Ricardo Perez <ricardo.o.perez at intel.com> ---
For CoffeeLake S UDIMM RVP QA system, the following test is failing :

igt at kms_setmode@basic

Running:
IGT-Version: 1.21-g37bd27f (x86_64) (Linux:
4.15.0-rc9-drm-intel-qa-ww4-commit-59275f1+ x86_64)

**** DEBUG ****
(kms_setmode:11956) INFO: Testing: basic 1 connector combinations
(kms_setmode:11956) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=1920,
height=1080, format=0x34325258, tiling=0x0, size=0)
(kms_setmode:11956) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=1,
pitch=7680)
(kms_setmode:11956) INFO:   Test id#1 CRTC count 1
(kms_setmode:11956) INFO:     CRTC[37] [Pipe A] Mode: 1920x1080 at 60Hz
Connectors: eDP-1[49]
(kms_setmode:11956) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=1920,
height=1080, format=0x34325258, tiling=0x0, size=0)
(kms_setmode:11956) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=2,
pitch=7680)
(kms_setmode:11956) INFO: Expected frametime: 16653us; measured 16653.0us +-
5.483us accuracy 0.10% [1.10 scanlines]
(kms_setmode:11956) CRITICAL: Test assertion failure function check_timings,
file kms_setmode.c:491:
(kms_setmode:11956) CRITICAL: Failed assertion: accuracy < line_time(kmode)
(kms_setmode:11956) CRITICAL: vblank accuracy (16.450us, 0.1%) worse than a
scanline (14.922us)
(kms_setmode:11956) igt-core-INFO: Stack trace:
(kms_setmode:11956) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(kms_setmode:11956) igt-core-INFO:   #1 [test_one_combination+0xd8c]
(kms_setmode:11956) igt-core-INFO:   #2 [main+0x525]
(kms_setmode:11956) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(kms_setmode:11956) igt-core-INFO:   #4 [_start+0x2a]
(kms_setmode:11956) igt-core-INFO:   #5 [<unknown>+0x2a]
****  END  ****

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