[Bug 65757] [snb pch eDP regression] Screen sometimes remains black after mode change - old fast & narrow link is more stable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65757

--- Comment #9 from Egbert Eich <eich at pdx.freedesktop.org> ---
(In reply to comment #8)
> Just to clarify: The magic to make this work is to run the edp panel power
> sequencing calls?
> 
> If that's the case I'd vote to quirk this to be an eDP port: In 3.11 we've
> refactored all the checks to clearly separate sink-related eDP stuff
> (backlight, panel power sequencing) from the differences in the eDP source
> ports. So we can freely adjust this without changing anything else.
> 
> For the quirk itself there's hopefully a bit in the DPCD telling is it's an
> eDP sink, otherwise I guess we'd a dmi new quirk table.

If there is such a bit in the DPCD it would be generic and worthwhile adding to
the driver.

However the latest development in this story is that we have now received word
from the manufacturer that the system got retested with the a new version of
the Chrontel eDP -> LVDS converter firmware. So far the blank screen issue has
not been seen any more during those tests.
We are still waiting for a definitive report (we will also test ourselves) - if
this is true the firmware update has succeeded in making the device connected
to the GPU look like a regular DP device like the BIOS setting suggests.

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