[Bug 27314] displayport link training fails on certain panels (channel equalization fails)

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changed bug 27314
What Removed Added
CC   b.bellec@gmail.com

Comment # 72 on bug 27314 from
I bought a new screen and it looks like I have the same issue.

Hardware is:
GPU: Radeon HD5850 (1GB)
Screen: Dell U2414H
Connection: DisplayPort (GPU) / MiniDisplayPort (Screen)

Software is:
Fedora 23 (64-bit)
Kernel 4.2.8

At Fedora loading my screens got no more signal and enter in sleep mode. If I
unplug and replug the DisplayPort cable the screen connection is recovered.

The log shows these 2 messages:
[drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5 tries
[drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed


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