[Bug 271897] Loading amdgpu and i915kms kernel modules simultaneously causes the system to crash

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271897

            Bug ID: 271897
           Summary: Loading amdgpu and i915kms kernel modules
                    simultaneously causes the system to crash
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: doctorwhoguy@gmail.com

I have a desktop system with a Radeon RX 240 graphics card and an Intel
i7-3770S CPU which has Intel HD 4000 integrated graphics. I did a fresh install
of 13.2-RELEASE yesterday with the intention of using OBS studio for content
creation. I use the Radeon graphics card to drive my primary display, and I
have a second display connected to the integrated graphics port. I also use the
integrated GPU for hardware video encoding. As such, I need to use the amdgpu
kernel module to provided accelerated graphics on my primary display and
i915kms to enable hardware video encoding on the integrated GPU. That's what
led me to try loading both kernel modules and to discover that the system
crashes, does a kernel dump, and reboots. It would be really nice to get these
two modules playing well together for my intended use case.

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