[Bug 212371] Screen displays garbage after `kldunload i915kms`

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212371

            Bug ID: 212371
           Summary: Screen displays garbage after `kldunload i915kms`
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: afiskon at devzen.ru

Hardware:

- Fujitsu Lifebook E733 laptop
- Intel HD Graphics 4000

I have:

```
i915kms_load="YES"
```

... line in /boot/loader.conf

I noticed that after executing `kldunload i915kms` screen turns black. And here
is how it looks after pressing any button on a keyboard:

http://afiskon.ru/s/a8/e3031de09a_garbage.jpg

Granted it's a minor issue since most users will never unload i915kms. Still it
would be nice if driver could be properly unloaded.

Naturally if you need any additional information to debug this issue I would be
happy to provide it.

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