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From: John Baldwin <jhb@freebsd.org>
To: Marcin Cieslak <saper@saper.info>
Subject: Re: panic: resource_list_alloc: resource entry is busy
Date: Mon, 15 Sep 2014 11:22:35 -0400
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On Friday, September 12, 2014 10:03:26 PM Marcin Cieslak wrote:
> On Fri, 12 Sep 2014, John Baldwin wrote:
> >> Please note I originally loaded "i915.ko", not "i915kms.ko"
> > 
> > Oh, that is probably your problem.  X loaded i915kms automatically and
> > i915 and i915kms do not get along.  i915 had already allocated the IRQ
> > when i915kms tried to alloc the same IRQ causing the issue.
> 
> Would that be possible to fail with EBUSY or something instead of panic?

Yes, though in this case you probably will end up with a black screen and an 
apparent hang due to how KMS works which wouldn't be a lot better. :(

-- 
John Baldwin