same issue with Asus ux21a,  3.16.0-24-generic:

dmesg | grep voltage
[    2.659756] [drm:intel_dp_start_link_train] *ERROR* too many voltage 
retries, give up
[  936.220837] [drm:intel_dp_start_link_train] *ERROR* too many voltage 
retries, give up
[ 3230.334988] [drm:intel_dp_start_link_train] *ERROR* too many voltage 
retries, give up
[ 4568.440454] [drm:intel_dp_start_link_train] *ERROR* too many voltage 
retries, give up

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https://bugs.launchpad.net/bugs/1359117

Title:
  lightdm and xorg fails to start after kernel update, voltage errors

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