[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 #44 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
Still valid in all the platforms:

Results for igt at kms_setmode@basic
Result: fail

Out     
IGT-Version: 1.22-gda00bf8 (x86_64) (Linux:
4.16.0-rc7-drm-intel-qa-ww14-commit-29940f1+ x86_64)
Testing: basic 1 connector combinations
  Test id#1 CRTC count 1
    CRTC[39] [Pipe A] Mode: 1920x1200 at 60Hz Connectors: VGA-1[52]
Expected frametime: 16681us; measured 16626.4us +- 2.845us accuracy 0.05% [0.63
scanlines]
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [test_one_combination+0xdad]
  #2 [main+0x4c6]
  #3 [__libc_start_main+0xf1]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Subtest basic: FAIL (2.329s)
Err     
(kms_setmode:10495) CRITICAL: Test assertion failure function check_timings,
file kms_setmode.c:520:
(kms_setmode:10495) CRITICAL: Failed assertion: fabs(mean - expected) < 1.718 *
stddev
(kms_setmode:10495) CRITICAL: vblank interval differs from modeline! expected
16680.5us, measured 16626us +- 2.845us, difference 54.1us (19.0 sigma)
Subtest basic failed.
**** DEBUG ****
(kms_setmode:10495) INFO: Testing: basic 1 connector combinations
(kms_setmode:10495) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=1920,
height=1200, format=0x34325258, tiling=0x0, size=0)
(kms_setmode:10495) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=1,
pitch=7680)
(kms_setmode:10495) INFO:   Test id#1 CRTC count 1
(kms_setmode:10495) INFO:     CRTC[39] [Pipe A] Mode: 1920x1200 at 60Hz
Connectors: VGA-1[52]
(kms_setmode:10495) igt-fb-DEBUG: igt_create_fb_with_bo_size(width=1920,
height=1200, format=0x34325258, tiling=0x0, size=0)
(kms_setmode:10495) igt-fb-DEBUG: igt_create_fb_with_bo_size(handle=2,
pitch=7680)
(kms_setmode:10495) INFO: Expected frametime: 16681us; measured 16626.4us +-
2.845us accuracy 0.05% [0.63 scanlines]
(kms_setmode:10495) CRITICAL: Test assertion failure function check_timings,
file kms_setmode.c:520:
(kms_setmode:10495) CRITICAL: Failed assertion: fabs(mean - expected) < 1.718 *
stddev
(kms_setmode:10495) CRITICAL: vblank interval differs from modeline! expected
16680.5us, measured 16626us +- 2.845us, difference 54.1us (19.0 sigma)
(kms_setmode:10495) igt-core-INFO: Stack trace:
(kms_setmode:10495) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(kms_setmode:10495) igt-core-INFO:   #1 [test_one_combination+0xdad]
(kms_setmode:10495) igt-core-INFO:   #2 [main+0x4c6]
(kms_setmode:10495) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(kms_setmode:10495) igt-core-INFO:   #4 [_start+0x29]
(kms_setmode:10495) igt-core-INFO:   #5 [<unknown>+0x29]
****  END  ****

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