To add to LeFrettchen's post:
A simple intervention to try would be to disable the onboard video (Intel HD Graphics 4000) in the bios.
Another alternative is that current just had intel video updates
Quote:
Changes made between OpenBSD 5.3 and -current
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Added proper mmap(2) support for drm(4)/inteldrm(4). Eventual speedups (through not accessing all graphics memory via the GTT).
Added the remaining support code for 4th gen intel(4) Core/Haswell graphics.
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