[Bug 105637] i915 crashes MacBook2,1 with commit 23ac12732825901b3fc6ac720958d8bff9a0d6ec (4.15)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105637

--- Comment #31 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 141764
  --> https://bugs.freedesktop.org/attachment.cgi?id=141764&action=edit
[PATCH] drm/i915: Restore vblank interrupts earlier

The obvious fail I see in the code is that we're going to try a vblank wait
without vblank interrupts yet being enabled. Though that should not really
cause a hang, and rather we should just get a WARN from the vblank code. Hmm.
Or maybe not. I suppose bad thing might happen if we haven't called
drm_vblank_reset() yet. Worth a shot at least. Please test.

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