Broken msi interrupts on Intel gfx

[Robert Noland]

I finally tracked down the root problem with msi interrupts on Intel
chips.  It should be fixed in r194644 on -CURRENT for UP kernels.  SMP
remains broken right now due to another issue, though hopefully it will
be resolved in the next couple of days.  MFC to 7 is scheduled for 1
week, though for the adventurous the patch should apply to -STABLE and
fix things on both UP and SMP kernels.

This is the "slow windows after vt switch" issue among other possible
problems.

robert.

-- 
Robert Noland <rnoland at FreeBSD.org>
FreeBSD
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