After returning from suspend the keyboard and mouse doesn't respond [closed]

I have 64-bit Ubuntu 14.04 on Dell Inspiron-3537. After resuming from suspend it takes me to log-in screen, and I'm unable to move cursor and no hotkeys are working nor "ctrl+alt+f1". I tried sudo pm-suspend and after resuming it takes me to my desktop and this time I'm able to move my cursor but again nothing won't work. Graphic drivers are installed.

I had the exact same problem, I am assuming you are using a kernel newer than 3.12. It happened to me after the kernel upgrade. The solution is to try another kernel. Mine was fixed by downgrading to 3.12. LP told me it may be fixed if I upgrade to 3.15, but i did not try that.