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Yesterday I installed Ubuntu 11.04 from scratch on my Thinkpad R500, leaving the default power management settings.

Yesterday I closed the lid, and this morning when I opened it the laptop resumed correctly.

Today during lunch the laptop went to sleep without me closing the lid, and there was no way to wake it up by typing ESC or moving the mouse or TrackPoint. No disk activity at all. When I briefly pushed the POWER button, the laptop rebooted completely, losing my opened applications.

Is it a known problem with Natty/Lenovo Thinkpad R500/ATI?
Any idea what could fix the problem?

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closed as too localized by James Feb 27 '12 at 1:31

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

I also faced similar problem. May be there is a problem with video drivers/screen saver. What I did was I have chosen blank screen for my screen saver and also unchecked the option of "Lock screen when screen saver is active" under System->Preferences->Screensaver.... – samarasa May 30 '11 at 6:40
I have this problem also (on a Lenovo Thinkpad W500). It seems to be correlated with the screen locking, not the suspend/resume exactly. Oddly, the mouse cursor remains visible and even changes between cursor/hand/pointer depending on where in the screen it is; but windows are not visible. – Shimon Rura Jul 2 '11 at 23:56
Are you still experiencing this issue? – James Feb 25 '12 at 21:47
@jrg: Not anymore. Should I close it? delete it? – Nicolas Raoul Feb 27 '12 at 1:19
@NicolasRaoul You don't have to do anything, I just closed it for you. Thanks for answering! :) – James Feb 27 '12 at 1:32