Toshiba Satellite L855D with fresh 14.04 LTS install, will not suspend, screen goes dark for 2 seconds, then shows the lock screen.
Another post suggested trying:
sudo modprobe toshiba_acpi
but this has not made a difference.
My computer is an AMD A8-4500M APU with Radeon(tm) HD Graphics × 4 Gallium 0.4 on AMD ARUBA.