[Bug 94825] LVDS blank screen on GM45

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94825

--- Comment #12 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 122765
  --> https://bugs.freedesktop.org/attachment.cgi?id=122765&action=edit
[PATCH] drm/i915: Try to get EDID via ACPI _DDC if i2c fails for  LVDS/eDP

Since the VBT route seems a dead end I'm starting to wonder if we shouldn't be
trying to get an EDID via ACPI. Can't be sure there is one of course, but
supposedly we should have some way to figure out the panel timings and I can't
think of another method we're missing.

If this fails, I suppse the final option is to just ignore the VBT in case the
LVDS is already on when the driver loads and just use the current timings.

Totally untested so might blow up or something.

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