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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Sam Leffler <sam@freebsd.org>
Date: Thu, 26 Mar 2009 13:39:28 -0400
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Subject: Re: [HEADSUP] amd64 suspend/resume code to be comitted [more
	successes]
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On Thursday 26 March 2009 01:08 pm, Sam Leffler wrote:
> Jung-uk Kim wrote:
> > On Thursday 26 March 2009 12:24 pm, Sam Leffler wrote:
> >> FWIW I've tried this on 2 amd64 laptops w/ fairly good success.
> >> Both are running HEAD as of yesterday and have latest ports
> >> builds.
> >>
> >> Intel T61P (SMP) running gnome2 suspends+resumes with
> >> hw.acpi.reset_video=1.  I had to restart moused on resume to get
> >> the touchpad back but usb did not come back (usbconfig shows the
> >> hubs but no devices and devices do not enumerate on re-attach).
> >
> > Some touchpads require reinitialization while resuming.  See
> > sys/dev/atkbdc/psm.c and look for PSM_CONFIG_HOOKRESUME and
> > PSM_CONFIG_INITAFTERSUSPEND flags and some code arround
> > PSM_RESETAFTERSUSPEND.  usb2 stack seems to have resuming issues
> > but I didn't care much about it because the stack itself is a
> > moving target ATM. ;-)
>
> Right, forgot about those tweaks.  I just wish all these little
> knobs could be captured in some form so users could just say "I've
> got an xyz laptop" and have the right thing happen instead of
> having to google for everyone's experimental findings.

Yes, it would be nice. :-(

> >> HP6125 (UP) running kde4 suspends+resumes w/o any tweaks.  USB
> >> came back on this machine but the touchpad did not (haven't
> >> tried restarting moused yet).  Some devices didn't restore; e.g.
> >> an ath card in the cardbus slot didn't reappear.
> >
> > You know who to prod, don't you? :-P
>
> Actually ath resumes fine on T4x i386 UP systems for me so I think
> this more likely cardbus.

That's what I meant, actually.  It could be generic PCI driver, too.  
Sorry for more little tweaks but you may try 
"hw.pci.do_power_nodriver" and "hw.pci.do_power_resume" tunables.

Jung-uk Kim