[Bug 99272] New: Displayport hotplug detection races with nonblocking modeset.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99272

            Bug ID: 99272
           Summary: Displayport hotplug detection races with nonblocking
                    modeset.
           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: bugs at mblankhorst.nl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128751
  --> https://bugs.freedesktop.org/attachment.cgi?id=128751&action=edit
dmesg warning indicating the race

With nonblocking modeset enabled in i915, there's a testcase failure in
kms_atomic_transition and kms_cursor_legacy that shows that nonblocking modeset
can race against hotplug.

Relevant testcases:
kms_atomic_transition.1x-modeset-transitions-nonblocking
kms_cursor_legacy.nonblocking-modeset-vs-cursor-atomic
kms_cursor_legacy.long-nonblocking-modeset-vs-cursor-atomic (same, but more
iterations)

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