[Bug 100540] New: [hsw] i915 resume latency 909 ms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100540

            Bug ID: 100540
           Summary: [hsw] i915 resume latency 909 ms
           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: jani.nikula at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Moving from https://bugzilla.kernel.org/show_bug.cgi?id=76211 reported by Len
Brown.

The last observation there was:

This problem still exists in Linux-4.8.0, though the delay
on this machine is now 909 ms, rather than 1,200 ms.

Attached, please find the analzye_suspend.py output as run
on the same laptop as above, installed with Ubuntu 16.10
and its 4.8.0-22-generic kernel.

Curiously, i915 resume invokes intel_hdmi_detect FOUR TIMES --
twice in a kthread, and again twice in-line.  This costs 160ms
each time it is invoked.

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