[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 #23 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Mika Kahola from comment #22)
> Could a solution here be that if we have a branch device that doesn't
> support DPCD OUI we set DPMS OFF in that case as Ville's patch suggests?

We might want to limit this to DPCD 1.1 devices as those don't have the
BRANCH_DEVICE_CTRL register, and for DPCD 1.2+ we should perhaps just try to
frob BRANCH_DEVICE_CTRL to use long pulses instead. In fact long pulse should
be the default, but I'm not sure I'd trust these things that far. Not sure we
can even trust that they respect the setting in BRANCH_DEVICE_CTRL at all, but
at least we could try it and see.

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