[Bug 95236] [BAT various] kms_flip fails with "inter-flip ts jitter: 0s, 183334usec" or similar time around 180msec

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95236

--- Comment #1 from david.s.gordon at intel.com ---
Example from bdw-i7-5600u:

IGT-Version: 1.15-gbc570aa (x86_64) (Linux:
4.7.0-rc2-gfxbench-RO_Patchwork_1178+ x86_64)
Using monotonic timestamps
Beginning basic-flip-vs-wf_vblank on pipe A, connector eDP-1
  1920x1080 60 1920 1968 2000 2080 1080 1083 1088 1111 0x9 0x48 138700
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [check_state+0x32b]
  #2 [<unknown>+0x32b]
Subtest basic-flip-vs-wf_vblank: FAIL (4.838s)

(kms_flip:7666) CRITICAL: Test assertion failure function check_state, file
kms_flip.c:698:
(kms_flip:7666) CRITICAL: Failed assertion: fabs((((double) diff.tv_usec) -
usec_interflip) / usec_interflip) <= 0.005
(kms_flip:7666) CRITICAL: Last errno: 25, Inappropriate ioctl for device
(kms_flip:7666) CRITICAL: inter-vblank ts jitter: 0s, 216597usec
Subtest basic-flip-vs-wf_vblank failed.

Somewhat longer than 180ms in this example, but otherwise very similar.

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