Re: ACPI/APM suspend errors related to yds

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On Thu, 31 Jul 2008 12:36:11 -0400
"Steven M. Bellovin" <smb%cs.columbia.edu@localhost> wrote:

> On Thu, 31 Jul 2008 18:28:52 +0200
> Joerg Sonnenberger <joerg%britannica.bec.de@localhost> wrote:
> 
> > On Thu, Jul 31, 2008 at 12:27:20PM -0400, Steven M. Bellovin wrote:
> > > I build a DIAGNOSTIC kernel from yesterday's source, since I
> > > already had a full build lying around.  Running single-user, I
> > > tried
> > > 
> > >   sysctl -w machdep.sleep_state=3
> > > 
> > > and it hung.  I realized I hadn't turned off one CPU, so I tried
> > > that, but 'cpuctl offline 1' hung.
> > 
> > Known issue. The recent changes from rmind made it work better, but
> > it still fails when cpuctl is running on the CPU it tries to
> > offline (I think).
> > 
> Is there a work-around?  Is there a way to suspend a dual-core system
> without that? 
> 
I built a kernel with DIAGNOSTIC and up-to-the minute source, disabled
one CPU via the BIOS menus, and tried suspending.  There were no new
messages printed, and I still couldn't resume.


                --Steve Bellovin, http://www.cs.columbia.edu/~smb