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From: John Baldwin <jhb@freebsd.org>
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Date: Tue, 29 Nov 2011 08:42:12 -0500
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	(bigwig.baldwin.cx); Tue, 29 Nov 2011 09:07:32 -0500 (EST)
Cc: Sebastian Chmielewski <chmiels@o2.pl>
Subject: Re: Suspend and resume on Dell E6520
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On Monday, November 28, 2011 12:15:25 pm Jung-uk Kim wrote:
> On Thursday 24 November 2011 01:33 am, Sebastian Chmielewski wrote:
> > On Wed, 23 Nov 2011 20:50:58 -0500
> >
> > Jung-uk Kim <jkim@FreeBSD.org> wrote:
> > > Usually, we cannot resume console on NVIDIA graphics, which often
> > > times lack or has incomplete VBE save/restore state function.
> >
> > I had kldunload nvidia in rc.suspend. Isn't that enough?
> 
> No, it doesn't (can't) save/restore GPU state.  In fact, nvidia.ko may 
> help when you are suspending from X11.  At least in theory, it should 
> be able to save/restore GPU state correctly.  However, a NVIDIA 
> engineer once told me that the code path wasn't tested well because 
> he couldn't find a right laptop to test at the time.  It was long 
> ago, though.

Yes, the nvidia folks would probably work on fixing suspend and resume of 
nvidia GPUs if we could point them at a laptop for which suspend and resume 
otherwise worked.

-- 
John Baldwin