drm-i915-update-38, no output on high resolution display

[Stefan Grundmann]

hi,

during testing on a Lenovo Thinkpad W541 (20EF0020GE: Core i7-4910QM, NVIDIA Quadro K2100M optimus)
i found that after commit 72bb3b3f9dcaf573be532ced9043eb59dedf21df "drm/i915: set TRANSCODER_EDP even earlier",
kldload i915kms results in a blank internal display (eDP1, 2880x1620).

reverting 72bb3b3f9dcaf573be532ced9043eb59dedf21df make the output work again on all tested revisions.

best regards

Stefan Grundmann