[Bug 91393] [bdw edp] Screen Flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91393

--- Comment #31 from Mika Kahola <mika.kahola at intel.com> ---
Created attachment 119983
  --> https://bugs.freedesktop.org/attachment.cgi?id=119983&action=edit
Make DP fast link training option as module parameter

I wasn't able to replicate this issue of flickering screen with the HW that I
had available. However, that doesn't rule out the fact that there truly is a
problem. It seems that there are panels out there that simply doesn't like to
start DP link training with non-zero values. 

The patch here makes this fast link training feature as one module parameter
(/sys/module/i915/parameters/enable_dp_flt) so you can enable or disable the
feature depending on panel support. By default this feature is disabled. The
patch applies to drm-intel-nightly.

Please, give this patch a try and report back with dmesg log if the problem
still exists.

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