[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 #23 from Gary Wang <gary.c.wang at intel.com> ---
Customer's device encounters this issue on Ubuntu 12.04.1/14.04,

For this issue in Ubuntu 14.04,
1. Remove DP cable from docking's DP port also cause this issue (hot-plug event
lost) when extended mode is enabled via DP port. (device’s DP2)
2. Remove DP cable from NB’s DP port doesn't cause this issue when extended
mode is enabled via DP port. (device’s DP1)                                     
3. When VGA port caused this issue, DP port also got trouble (no hot-plug
event).

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