Comment 52 for bug 1357090

I believe this is more than just an xubuntu issue or a laptop one in 14.04. I run a desktop with stock ubuntu and unity, 12.04.4 fully upated via the repositories with no foreign drivers for the graphics. ie nouveau as supplied in the original install and updated only via normal updates if nouveau has ever been updated in 12.04. The graphics card is Nvidia at least 3 years old and certainly not one of the esoteric ones, probably close to the bottom of the nvidia range. Suspend resume works perfectly.
On setting up 14.04 for testing on the same hardware with the exception that 14.04 is on an hd whereas 12.04 is on an ssd, it would not resume with the keyboard and mouse hanging alternatively and never being able to get back to an operating desktop. I went as far as doing a suspend from a real terminal using pm-suspend. I could revert to the terminal but still not the desktop. My rudimentary testing indicates its a nouveau driver issue. I tried the 12.04 kernel on the 14.04 but to no effect. I installed the nvidia binary and hey presto suspend resume works. As Linus says nouveau driver taints the kernel!! At the moment the relevant desktop is out of action but a I can resurrect it should you require some log/error report dumps as specified by you.