I had this problem too, and fixed it.
I actually had the same issue (working fine until sleep/wake) with my wireless. I just applied the solution I found for that to the touchscreen and it worked.
Previously I'd been manually unloading and reloading the wifi module with these two commands after every resume from sleep:
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sudo rmmod r8192e_pci; sudo modprobe r8192e_pci
Which worked, but was a bit cumbersome. This forum post pointed to a website that told me how to get the computer to do this automatically:
http://www.voria.org/forum/viewtopic.ph ... t=15#p5165
you need to create a file called unloadmodules, in the directory /etc/pm/config.d/ and put a line in it like SUSPEND_MODULES=”r8192e_pci hid_egalax” with a space separated list of all the modules you want given a kick on resume (you can use
lsmod to list the ones active on your system).
The original post tells you to use vi, which is what I used, but it can be a bit scary so this line should create/overwrite (so check there's nothing there first) the file with the single line in it:
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sudo echo 'SUSPEND_MODULES="hid_egalax"' > /etc/pm/config.d/unloadmodules
Note that there's a closing double quote and then a single closing quote before the > character. A reboot and that should be you.