[Bug 89554] [SKL Bisected] eDP can not be lighted up after entering kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89554

--- Comment #46 from ye.tian <yex.tian at intel.com> ---
(In reply to Sonika from comment #45)
> (In reply to ye.tian from comment #44)
> > (In reply to ye.tian from comment #43)
> > > Test it on the latest nightly kernel(87afe90f) with i915.edp_vswing=2, This
> > > issue has gone away.
> > 
> > Without i915.edp_vswing=2, This issue also has gone away.
> > Verified.
> 
> Without i915.edp_vswing=2, the issue is not reproducible? Strange..
> By default it uses VBT's input.
> If it works without this param, are you sure you are using the original
> setup with default vbt (and not the stitched one in which the default value
> was changed)?

I am sure.
BTW, I re-test it on the other machine, it can't work without this param.

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