I have an HP Pavilion DV9000z (AMD) and am seeing similar issues.
However, rather than focusing on the video controller, I want to propose
another culprit: the Broadcom Wireless Network Controller

A couple notes on the system:

* Dual Core AMD Turion 64
* nVidia GeForce GO 7600
* Broadcom BCM4312
* 1GB RAM 

Basic OS Info (more to come later as attachments):

Linux feathers 2.6.24-16-generic #1 SMP Thu Apr 10 12:47:45 UTC 2008
x86_64 GNU/LinuxDISTRIB_ID=Ubuntu

DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu 8.04"


So back to my proposal. For me on my system, if I shut down all applications 
that make outgoing connections (think Pidgin, Thunderbird, Firefox [if 
connections are still in a TIME_WAIT state], etc.) are running and have 
connections to the network made, the system hangs on any hibernate attempts. 

The test I did to gain relative confidence in this theory was simple. I
ran netstat prior to each hibernate attempt like so:

netstat --inet --inet6

That dumps out all of the current live connections for IPv4 and IPv6 (if
there were any). Having services LISTENing does not seem to make a
difference as I have sshd running and was still able to hibernate so
long as there were no "live" connections at the time of hibernation. So
the gist is that if there are no entries in the netstat output, the
machine typically will hibernate for me.

I am using the b43 driver as it seems to be more stable now in the
general release of Hardy. Also since this is a Pavilion, I am also no
longer using the funky kernel workarounds (noapic, irqpoll, noirqdebug)
to keep the system from hanging as it appears those patches to clean
that up finally made it into the kernel. Prior to that, i was using
those workarounds as well as ndiswrapper to get WIFI and let's just say
that all bets were off on hibernation, etc.

As far as other testing, I have brought the machine into single user
mode and have tried to manually suspend and hibernate the machine. Both
work great except for suspend. When I resume, I have to issue "vbetool
dpms on" to turn the backlight back on...

This might be an offshoot into another bug if it proves to be separate
issue. It may already even be a bug that I have yet to find. But in any
case, I would love to see others try to see if this has any effect on
their hibernation outcomes.


** Attachment added: "lshw.txt"
   http://launchpadlibrarian.net/14188499/lshw.txt

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Suspend/hibernate does not work with HP Pavilion dv9340ea
https://bugs.launchpad.net/bugs/203552
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