[Bug 194420] New: [vt] unloading i915kms causes black screen and reboot.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194420

            Bug ID: 194420
           Summary: [vt] unloading i915kms causes black screen and reboot.
           Product: Base System
           Version: 10.0-STABLE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sasamotikomi at gmail.com

I update my system (freebsd-update) from 10.1-RC1 to 10.1-RC2 and I see problem
with unloading kernel module:
I can load module(without X):
# kldload i915kms (I think all fine but screen isn't cleaning for some reason)
If I try unload kernel module (without X):
# kldload i915kms
I got black screen and system freeze(keyboard and mouse isn't work) and after
5-10 min just reboot without panic or any message.
Hardware is intel GMA 3150.

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