After upgrading to 12.04 suspend no longer works. Going into suspend seems to work, screen, fan, disk and LED's shuts down. When trying to resume I can hear the fan staring up for a second or two before switching off again, the LED's light up again but the screen doesn't. I tried to login (with screen off), but it makes no difference, the only thing I can do is unplug it and remove the battery to reboot it. I had this problem before when installing AMD proprietary graphics driver, but not when using Radeon driver.
What can I do to troubleshoot this?
Lenovo Ideapad s205, AMD E-450, Ubuntu Desktop 12.04 AMD64. Open source Radeon graphics driver. Compiled Ralink proprietary linux RT3090 Wifi driver.