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

[bugzilla-daemon at freedesktop.org]

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

David Weinehall <david.weinehall at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from David Weinehall <david.weinehall at intel.com> ---
@Len Brown: Could you provide the output of:

cat /sys/kernel/debug/dri/0/eDP-1/i915_panel_timings

and

analyze_suspend.py -config config/suspend-callgraph.cfg -maxdepth 0 -filter
i915

on a recent kernel (preferably drm-tip)?

The callgraph is needed to be able to pinpoint the functions that slow us down,
and running on a recent kernel will ensure that the issue hasn't already been
fixed.

The multiple invocations of intel_hdmi is most likely triggered by hotplug
detection of external displays. That logic is, to say the least, fairly hairy.
There have been some fixes to that area since 4.8 though, as well as various
other fixes to lower suspend/resume times.

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