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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27314

Benjamin Bellec <b.bellec at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b.bellec at gmail.com

--- Comment #72 from Benjamin Bellec <b.bellec at gmail.com> ---
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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