Both my touchpad and keyboard on my laptop fail after resume. I'm
working around it by:

1) Adding to defoptions in /boot/grub/menu.list:
> i8042.reset
(Some people recommend i8042.nomux, but doing this caused my keyboard and 
touchpad to occasionally freeze up largely at random during use, requiring the 
use of an external mouse/keyboard to suspend & resume before they worked again)

2) Creating /etc/acpi/suspend.d/71-mouseunload.sh:
> #!/bin/sh
> modprobe -r psmouse
> echo -n "i8042" > /sys/bus/platform/drivers/i8042/unbind

3) Creating /etc/acpi/resume.d/34-mouseload.sh 
> #!/bin/sh
> echo -n "i8042" > /sys/bus/platform/drivers/i8042/bind
> modprobe psmouse

4) Setting DOUBLE_CONSOLE_SWITCH=true in /etc/default/acpi support (I
haven't actually tested if this is still neccesary, but it used to make
all the difference)

This setup has been working fine for me for several months now.

-- 
Synaptics touchpad ceases functioning after suspend and resume.
https://bugs.launchpad.net/bugs/59867
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