Comment 171 for bug 640100

On Fri, Jul 08, 2011 at 03:16:20PM -0000, Arnon Klein wrote:
> It looks like it is a wireless device module issue. I'm using 11.04 with
> out-of-the-box kernel 2.6.38-8-generic .
>
> Patching up /usr/lib/pm-utils/sleep.d/55NetworkManager
> with :
>
> case "$1" in
> hibernate|suspend)
> suspend_nm
> modprobe -r ath9k
> ;;
> thaw|resume)
> modprobe ath9k
> resume_nm
> ;;
> *) exit $NA
> ;;
> esac
>
> solved this, and my N150 is now returning from suspend.

That's interesting. When I investigated I saw that the hang was most
definitely happening prior to resuming devices, so I'm not sure what the
relationship is. A lot of things seemed to make the problem harder to
trigger without completely eliminating it though; the hang appears to be
very timing sensitive. If you're interested you could try running an
automated S3 test to see whether you can trigger a hang. The following
would do 100 S3 iterations (you'll probably need to run 'sudo apt-get
install fwts' first):

  fwts s3 --s3-multiple=100

I'm no longer in posession of one of these machines to try it myself.