[Bug 94087] eDP panel exhibits sparse random noise and flickering (link issue), forcing DP DDI profile helps [Lenovo T450s]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94087

--- Comment #3 from Alexander Schremmer <alex at alexanderweb.de> ---
Wah, for BDW, the tick tock spaghetti in intel_ddi does not (!!!) respect the
disabled edp_low_vswing, at all (or I am blind). I.e. it forces low_vswing for
eDP.

This means that this has never been working for BDW since Nov 2013. Obvious
workarounds:

 1. Install Windows.
 2. Patch your kernel with Ben's patch.
 3. Upgrade your mainboard to Skylake.
 4. Wait for a fix by Intel.

Issue introduced by commit:

commit 300644c7dc4699fe9afb61b280aa5ed7109a4d93
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date:   Sat Nov 2 21:07:42 2013 -0700

Fix:

Correctly dispatch to the DP table for eDP in the case of non-low_vswing, like
for SKL.

I conclude:

Older T450s either never run Linux with the FHD panel in the T450s.

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