[Bug 85670] [hsw DP] Haswell Iris 5100 DisplayPort stops working when USB device is connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85670

--- Comment #5 from Andrzej Pronobis <a.pronobis at gmail.com> ---
> Does it make a difference what kind of USB device is connected to the port? 
There is a difference, but it is related to the use of USB 3.0. If I use a USB
stick using 2.0, things work fine. Then, even a usb stick that is capable of
using USB 3.0 will trigger the issue.

> Oh, and does the USB device work fine even if the DP stops working?
So far, yes. Although I did not test very extensively. It is detected and I can
successfully mount the USB stick or use the USB ethernet card.

> Also, can you reproduce the problem if you connect something to an USB port that is "distant" from the DP port?
I cannot. The other USB 3.0 port works fine and does not trigger the issue.

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