[Bug 71701] Regression, i915 DisplayPort link training via DP-to-VGA dongle, blank screen

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71701

--- Comment #29 from Kris Karas <bugs-a13 at moonlit-rail.com> ---
Updated the "Subject:" to better reflect this bug's actual cause.

Made two patches based on comment #27, one for mainline 3.13.6+ and the other
3.14.0+.  Went out for lunch, came back to discover that the second panel (our
affected one) would not unblank from screen-save.  Shut down X into console
mode, and the second panel came back.  So, it seems as if the
intel_wait_for_vblank() in i9xx_crtc_enable() and valleyview_crtc_enable() is
only a partial fix.

Alas, I am back to running my patch from comment #19, which works nicely.  Any
suggestions from the Intel folks on what else to try?

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