[Bug 224069] (Fix included) Use of uninitalized register value in vesa.ko, causing X, text console and suspend/resume to fail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224069

--- Comment #9 from Jung-uk Kim <jkim at FreeBSD.org> ---
(In reply to Stefan B. from comment #8)
> Btw, are you still interested in improving suspend/resume from STR to STD?

No, not really.

> In the FreeBSD forums, there are constant complaints regarding Nvidia cards.
...
> So I have the strong feeling that there is a serious problem with the vesa
> module. But that is just my (possibly misleading) intuition.

Ah, NVIDIA...  It is a well known problem for many years.  The root cause is
NVIDIA does not really support VESA BIOS re-POST and save/restore state calls. 
It just checks few bits and returns immediately if they are set/clear.  I have
a feeling that they intentionally did it to make reverse engineering harder. 
On top of that, they don't provide any information to improve the situation. 
Long time ago, I even bought couple of cheap NVIDIA controllers to fix the
problem but soon I gave up because I realized it was too complicated and I
wasn't desperate.  So, no, VESA module have no "serious" problem.  Just NVIDIA
doesn't want us to mess around with their hardware although we own it.

We can add few knobs in the driver to work around these issues and turn them on
by default if NVIDIA controller is found.

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