Comment 18 for bug 656631

It looks like I may have a fix/workaround that works for me, from this forum thread:
http://ubuntuforums.org/showpost.php?p=10100625&postcount=75

Basically, I add my wireless module ID to SUSPEND_MODULES in /etc/pm/config.d/unload_module. Not only does this seemed to have made my suspend/resume blank screen hangs disappear, but I've also noticed reconnecting to wifi networks, or connecting to a new one upon resume to be much faster (read above forum post for more details).

I should state that I barely understand what this is doing or why I'm doing it, but it was a suggestion that I've tried and it seems to work! I hope this somehow moves this issue along to a more final resolution.

Here's the basic commands I've used to apply this workaround...

$ lspci | grep Wireless
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller (rev 10)

$ lsmod | grep r8192
r8192se_pci 507324 0

# edit this file...
gksu gedit /etc/pm/config.d/unload_module &
# ...paste this line and save:
SUSPEND_MODULES="r8192se_pci"