Re: [Xen-devel] Host S3

[scorbin <steve.corbin@xxxxxxxxxxxxxxxxxxx>]

It looks like suspend.sf.net will not work.  The s2ram utility
requires /proc/sys/kernel/acpi_sleep_flags which does not exist in the
Xen patched Linux kernel.  It is removed via CONFIG_ACPI_PV_SLEEP.

So how are people using dom0 suspend/resume?  Any sample scripts/code?
Simply doing 'echo mem > /sys/power/state' does not restore the graphics
card.  I also tried a script I found on the web that effectively does:

# dump current data from the video card to the temporary file
cat /proc/bus/pci/$ID > $TMP_FILE

# suspend
echo -n mem > /sys/power/state

# restore video card data from the temporary file on resume
cat $TMP_FILE > /proc/bus/pci/$ID

with the same result that bare Linux works but booting with Xen does not
restore the video card.

- steve

On Wed, 2009-07-01 at 13:40 -0400, scorbin wrote:
> I tried it on a Dell, Lenovo and 2 HPs.  Upon further investigation it
> turns out the systems are resuming but the video card is not
> re-initialized.  It's strange because I can use the same procedure for
> Linux without Xen and the video resumes properly.
> 
> Searching the web I found suspend.sf.net.  Is this what people are using
> to do the video restore?
> 
> 
> On Wed, 2009-07-01 at 20:08 +0300, Tom Rotenberg wrote:
> > What is the hardware it didn't work for you?
> > 
> > 2009/7/1 scorbin <steve.corbin@xxxxxxxxxxxxxxxxxxx>
> >         What is the state of host suspend to ram?  I noticed that this
> >         functionality was put into 3.2 with fixes in 3.3.  I also saw
> >         something
> >         recently that indicates there might be a separate tree where
> >         suspend/S3
> >         is being developed/enhanced?
> >         
> >         I did try Xen3.3/Ubuntu8.04 and did not get host S3 to resume
> >         properly.
> >         Straight Ubuntu 8.04 suspends/resumes fine.
> >         
> >         
> >         
> >         _______________________________________________
> >         Xen-devel mailing list
> >         Xen-devel@xxxxxxxxxxxxxxxxxxx
> >         http://lists.xensource.com/xen-devel
> 
> 
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> 


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