laptop screen goes blank after waking from sleep

I have been facing this issue from the last week after some update. Whenever my laptop wakes up from suspend state it just shows me a blank screen. Regardless of whatever I do(move my mouse, press keyboard buttons) it just refuses to wake up. I am forced to do a restart and lose all my unsaved files. Has this issue been reported for Ubuntu 12.04?

I am using a Lenovo X200 with Intel Mobile 4 Series Graphics Chipset. Please let me know if any body has found a fix for this.

I has this issue on my X200. Workaround for me was:

Turn off screen lock in the "Brightness and Lock" settings.

The only problem is that it wakes without a password, which isn't too big of a deal for me.

I have this problem also, but with a desktop.
Currently using 12.04 X64 with an onboard AMD graphics and a ASUS 24" LED screen with HDMI.

If the system goes into suspend after 30 min, when I wake it up by keyboard or mouse, the only thing that is seen is the cursor AND my userid in top-right corner. This will last for about 2 or 3 minutes.

The cursor will change, as it is moved across the screen, depending on what the invisible contents of the screen are.

Eventually after a few minutes, the screen will re-appear. It is annoying- I have set my "suspend after" to the max- Seems that the max can be no more than one hour!

Hmmnn.. I just realized I'm now using Gnome-CLASSIC- perhaps THIS is the problem!
Will try to replicate this bu... um, "condition" by reverting to Gnome or Metro/Unity (or whatever Ubuntu's desktop is now called), to see if it happens there also.

Try the update from 2011/11/10 on this page (towards the bottom of the article). It will give you some logs on whats going on.

Steps 1 through 3 are also capable if fixing the inability to hibernate/sleep issue many have been having in Ubuntu. I've personally been using this fix for two years. **Book mark it! ;)

http://thecodecentral.com/2011/01/18/fix-ubuntu-10-10-suspendhibernate-not-working-bug/comment-page-12#comment-63510