I have a desktop machine (Intel Pentium G630 -- Sandybridge with HD3000 graphics) with the Intel H61 chipset. Ubuntu works well with this machine EXCEPT for when I put the computer to sleep. When I resume it from sleep (or suspend is what I guess is the Ubuntu nomenclature), it does not enable me to get to a working desktop. Instead, a blank screen with a hung cursor appears. Invoking a new shell (Ctrl+Alt+F4, F5, etc) so I could start the window manager (startx) does nothing. I have to reset the machine.
I'm thinking that this may be an issue with drivers, however, I have found out that this is a widespread problem. It has had similar behavior in Ubuntu 12.04/12.10 except sometimes the machine will resume successfully to a working desktop, only to freeze, requiring the REISUB trick to reboot.