[Bug 112051] Got call trace message "eDP powered off while attempting aux channel communication" while boot up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112051

--- Comment #12 from Imre Deak <imre.deak at intel.com> ---
Created attachment 145836
  --> https://bugs.freedesktop.org/attachment.cgi?id=145836&action=edit
Attempt to fix the VBT DDC pin mapping

The problem seems to be that the VBT DDC pin mapping info on your CFL doesn't
match the ones we use for CNP PCHs based on the VBT specification. Either the
VBT on your machines or the VBT spec we use is incorrect or my assumption that
the PCH with ID 0xA3C1 was wrong; I'll try to clarify this. 

For now could you try if the attached patch gets rid of the problem on the CFL
machine? Please also try your CML machine which should have an HDMI output and
I suspect it has the same problem.

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