[Bug 229794] GPU HANG error with drm-next-kmod and braswell under FreeBSD 11.2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229794

            Bug ID: 229794
           Summary: GPU HANG error with drm-next-kmod and braswell under
                    FreeBSD 11.2
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: allcoms at gmail.com

Created attachment 195163
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195163&action=edit
screenshot of FreeBSD 11.2 braswell GPU HANG error

I upgraded my FreeBSD server from 11.1 to 11.2 a couple of days ago. The main
reason I did so was in the hope that I would finally get accelerated graphics
working but I've had no such luck. The mobo is a Gigabyte N3150-N D3V which I
think uses a Braswell GPU, which is supposed to be supported by drm-next-kmod
in ports.

I installed xorg-video-intel, the kernel source for FreeBSD 11.2 and I
installed drm-next-kmod from ports then loaded the kernel module in rc.conf
with: 

kld_list="/boot/modules/i915kms.ko" 

When I try booting with the kernel module I get the error in the attached
screenshot. I have provided some more logs here:

https://forums.freebsd.org/threads/braswell-gpu-support.66678/

Thanks

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