Looking at your dmesg anyway, this pops out as interesting:
[ 135.356761] [drm] GMBUS timed out, falling back to bit banging on pin 2 [i915 gmbus vga]
Can you do a fresh boot and look at dmesg before and then after reproducing the problem. Does the printing of this line correlate to the issue occurring? If so, that's a strong clue...
Looking at your dmesg anyway, this pops out as interesting:
[ 135.356761] [drm] GMBUS timed out, falling back to bit banging on pin 2 [i915 gmbus vga]
Can you do a fresh boot and look at dmesg before and then after reproducing the problem. Does the printing of this line correlate to the issue occurring? If so, that's a strong clue...