guys, edit the file of pm-utils
/usr/lib/pm-utils/defaults

maxim...@maximiliano:/usr/share/emesene$ cat /usr/lib/pm-utils/defaults         
     
##########################################################                      
     
# DO NOT EDIT THIS FILE!                                 #                      
     
#                                                        #                      
     
# Add files in /etc/pm/config.d/ instead!                #                      
     
##########################################################                      
     

# Default method to power down the system when hibernating.
# If commented out, the system will use the kernel default as a 
# default value.                                                
#                                                               
# Check /sys/power/disk for valid values.  The default value    
# will be surrounded by [square brackets].                      
HIBERNATE_MODE="shutdown"                                       

# Whether we need to post the video card when resuming from
# hibernate. You should not normally need to set this.     
# In the future pm-utils will get this setting from HAL.   
#                                                          
# Valid values are "no" and "yes"                          
# HIBERNATE_RESUME_POST_VIDEO="no"                         

# The default sleep/wake system to use.  Valid values are:
#   kernel    The built-in kernel suspend/resume support. 
#             Use this if nothing else is supported on your system.
#   uswsusp   If your system has support for the userspace         
#             suspend programs (s2ram/s2disk/s2both), then use this.
#   tuxonice  If your system has support for tuxonice, use this.    
#                                                                   
# The system defaults to "kernel" if this is commented out.         
SLEEP_MODULE="uswsusp"

# These variables will be handled specially when we load files in
# /etc/pm/config.d.
# Multiple declarations of these environment variables will result in
# their contents being concatenated instead of being overwritten.

# If you need to unload any modules to suspend/resume, add them here.
SUSPEND_MODULES="nvidia ehci_hcd ohci_hcd uhci_hcd iwl3945"

# If you want to keep hooks from running, add their names  here.
# HOOK_BLACKLIST=""

# If you want to unconditionally add parameters to the commandline,
# add them here.
# ADD_PARAMETERS=""

# If you want to ignore commandline parameters, add them here.
# DROP_PARAMETERS=""

# If you need to synchronize the system clock across a suspend/resume or
# hibernate/thaw cycle, set this variable.
# NEED_CLOCK_SYNC="true"


i get the same as you, the suspend mode hangs my computer, but editing this 
file i get working all again...

-- 
backlight failed after suspend to ram on IBM X40
https://bugs.launchpad.net/bugs/292256
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