https://bugs.freedesktop.org/show_bug.cgi?id=107518

--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Shawn Anastasio from comment #2)
> Upon further testing, the issue seems to go away when the firmware is
> removed from petitboot, preventing it from initializing the card before the
> host OS. This indicates that it may have something to do with the GPU being
> initialized twice.

The hw requires a special reset before it can be initialized again.  This is
handled in driver for things like hibernate (S4) support.

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