[Bug 73539] [Haswell regression] eDP panel blank screen: link train fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73539

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[Haswell] eDP panel blank   |[Haswell regression] eDP
                   |screen: link train fails    |panel blank screen: link
                   |                            |train fails

--- Comment #20 from Daniel Vetter <daniel at ffwll.ch> ---
Aside: Same issue seems to happen on bdw, too.

Looking at the provided register dumps the bios indeed goes with a 4x lane
config. I guess we finally need to implement that bit of spec language that
says if link training fails we need to retry with lowered clocks.

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