Ubuntu 14.04 freezes after wake up

After wake up the login screen appears, but I cannot type the password to log in. Furthermore, the buttons on the system panel (e. g. to shut down) are disabled, so clicking does not take effect. I'm using Samsung RV509, 64 bit.

The OP provided the solution in a comment:

I've found the solution. I shouldn't have used the open source Xorg driver instead of the proprietary Nvidia driver that seems to work correctly.

– user278680 May 11 at 16:42

I had the exact problem of disabled keys & mouse after resuming from suspend. I've managed to solve it by switching from default display drivers to the NVIDIA 331.38 drivers. you can switch it easily on the HUD --> additional drivers. You would need to restart after you make the change.

I'm running Ubuntu 14.10 on GA-H81M-D3H motherboard without any separate GPU, and it's frozen after suspending randomly. All that remains is the log-in screen that you can neither move your mouse nor enter the tty mode. I figured out that the problem happened every time I triggered the audio on the system. Then I went to the bios setup -> peripherals -> audio controller, and changed its settings from "auto" to "enabled". It's now working!

I also had the same problem. Using HUD-->additional drivers, I was able to switch from the Xorg driver to the NVIDIA driver. (The number was different for mine than the 331.38 but this makes sense, I guess). Solved my problem of the login screen being frozen after waking from suspend.