[Bug 64880] [IVB cpu eDP] KMS Black Screen (link training)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64880

--- Comment #21 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 84519
  --> https://bugs.freedesktop.org/attachment.cgi?id=84519&action=edit
fix ivb dp volatge swing hw encoding

(In reply to comment #20)
> Created attachment 84070 [details]
> intel_reg_dump output (nomodeset, VESA Xorg)
> 
> This is the output of intel_reg_dump while booted with KMS disabled, and
> using VESA/Xorg in the background.

Thanks. I noticed one bug that might affect you, could you try the attached
fix? Another thing is that in the working case we are using a non-SSC clock
source while in the failing case we use an SSC one. So could you try booting
with i915.lvds_use_ssc=0?

Another difference is that the working case is with 1024x768, so would be
useful to see a regdump also with 1024x768 modesetting.

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