[Bug 87319] [BDW] Dock with builtin DP/VGA "dongle" fails cycling through modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87319

--- Comment #19 from Phidias Chiang <phidias.chiang at canonical.com> ---
(In reply to Gary Wang from comment #15)
> Pass: DP-port <-> Synaptic-DP-hub <-> DP EFP
> Pass: DP-port <-> Synaptic-DP-hub <-> external DP to VGA dongle <-> VGA EFP
> Failed: DP-port <-> Synaptic-DP-hub + built-in DP to VGA dongle <-> VGA EFP

Sorry, I should clarify our setup and result here:

       Monitor           Dock           Connector on Dock
Pass:    DP     <->  Synaptic-DP-hub    <->   DP
Failed:  VGA    <->  Synaptic-DP-hub    <->   VGA (built-in VGA/DP dongle)

I'm not sure the result of following setup:

  Monitor       Converter                   Dock             Connector on Dock
    DP  <-> ext. DP-to-VGA dongle  <->  Synaptic-DP-hub  <->     VGA 
    VGA <-> ext. VGA-to-DP dongle  <->  Synaptic-DP-hub  <->     DP

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