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I've had this happen a couple of times - screen saver kicks in, locks the screen, and when I put my password in to unlock it the system just seems to hang.
Cursor turns to the busy, HDD light flickers occasionally, but the only thing I can do at that point is power down.
This is on a desktop, not a laptop and according to the bios all the power saving is turned off.
Has anyone else seen this? Is there a way to prevent it, or at least diagnose the cause?
I faced the similar problem in the older versions of Ubuntu . Which version of Ubuntu you are currently using ? – ukanth – 2009-10-06T10:06:22.290
What are your system specs, particularly graphics card?
I used to have this problem fairly often. I think I narrowed it down to use of the closed source ATI drivers on a cheapo Radeon I was using. It had the symptoms of a memory leak in the driver or xserver. It didn't happen with the open source drivers and it went away completely with my new Nvidia card. – Joe Holloway – 2009-07-22T22:29:02.110
It's an N68 MB with an AMD chip, and an nVidia 9500 class card, using 180.x driver. I was having random hangs, but they were complete lockups - the mouse wouldn't even work, whereas with this, I can move the mouse. – chris – 2009-07-23T01:38:28.603