[Bug 95236] New: [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

            Bug ID: 95236
           Summary: [BAT various] kms_flip fails with "inter-flip ts
                    jitter: 0s, 183334usec" or similar time around 180msec
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: daniel at ffwll.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Various machines seem to be affected on various testcases. Looking at
igt at kms_flip@basic-flip-vs-wf_vblank affected machines are bsw-nuc-2,
bdw-ultra, byt-nuc, snb-x220t, ild-hp8440p. There might be more. Example log
from igt:



(kms_flip:6410) CRITICAL: Test assertion failure function check_state, file
kms_flip.c:698:
(kms_flip:6410) CRITICAL: Failed assertion: fabs((((double) diff.tv_usec) -
usec_interflip) / usec_interflip) <= 0.005
(kms_flip:6410) CRITICAL: Last errno: 25, Inappropriate ioctl for device
(kms_flip:6410) CRITICAL: inter-vblank ts jitter: 0s, 183335usec
Subtest basic-flip-vs-wf_vblank failed.

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