[Bug 101044] [SKL Xeon DP-to-VGA] no hotplug signal from DP-to-VGA branch device after unplug/replug cycle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101044

--- Comment #19 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Long ago I came up with this to fix my dongle:
https://lists.freedesktop.org/archives/intel-gfx/2015-July/070788.html
I'll have to re-test to see if my dongle still needs that or not.

Also there's a BRANCH_DEVICE_CTRL register in DPCD which supposedly allows you
to select whether short or long pulses are used for HPD notifications. It
should default to long pulse, but at least my dongle used to do short pulses by
default back when I came up with that patch. I don't think I ever tried to play
around with BRANCH_DEVICE_CTRL on my dongle to see if it made any difference. I
should do that as well.

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