[Bug 52601] Blank screen when booting 3.8-rc3

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52601


Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED




--- Comment #4 from Jani Nikula <jani.nikula at intel.com>  2013-01-14 09:23:54 ---
The machine seems to have a ghost eDP while the panel is LVDS.
intel_dp_init_connector() sets up panel power sequencing based on eDP VBT data
before noticing it's a ghost. (And, indeed, the machine seems to have an eDP
blob in the video BIOS.) The change in the bisected commit is that it starts
writing back the values to the power sequencing registers. The panel control
port select bits of PP_ON_DELAYS are likely the critical part, screwing up
LVDS.

As a side note, it would probably be sane to clean up intel digital port and
intel connector in intel_dp_init() if intel_dp_init_connector() fails.

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