[Bug 85924] [hsw DP-to-DVI] DP hot plug fails if booted without Monitor Attached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85924

--- Comment #43 from dog <paul.a.parenteau at intel.com> ---
Updating this thread, here's what one of our DP experts has to say:

"What’s supposed to happen is that when HPD asserts, we get an interrupt that
we process and fire off the appropriate work functions after we determine what
to do with it. The work functions are where all the good stuff happens, calling
the driver functions for ->detect()  and intel_dp_hpd_pulse. Then then we go
about setting up all the plane/pipe/port stuff for all the connectors that have
been detected as being connected. For DP, we then read the DPCD, read the EDID
and parse the display modes in it, figure out what the “preferred” mode is and
set up the link configuration for that (by default - userspace can override
it). There’s also a user space notification that takes place that notifies the
fbdev components and calls their helper functions too."

He's going to read through the dmesg logs to see how many steps in this process
are taking place.

Note:  Intel OTC is still unable to reproduce the problem. (See note from Paulo
above who is on my team)  We need to be able to reproduce the problem so the
matter can be investigated, preferably in the US or EMEA.

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