The issue is gone with 4.9.9. I suspect this commit did it:
commit f2a0409a08502d64fbe3990354dff5902b08d2fb
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Wed Sep 21 14:51:08 2016 +0100
drm/i915/execlists: Reset RING registers upon resume
commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae upstream.
I'm still experiencing that video stuttering after suspend/resume but the hang
doesn't happen anymore.
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https://bugs.launchpad.net/bugs/1653361
Title:
[Asus E502SA] Suspend/resume triggers random hang
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