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I leave my working PC powered and online when I leave office and it locks itself after some time and turns display off. None of other suspend features are active. When I get back at morning, it takes around 20 seconds for display to power on and more than minute or few for unlock password prompt to appear. After this, most often I simply give up and hard reset after 10 minutes of waiting for rest of UI to load up - nothing appears on screen except wallpaper.

Yes, I run some memory hogs - like Firefox, Chrome and Komodo Edit, all with dozens of open tabs, but this is never a problem if I leave for half-hour or so and then come back to unlock PC, this horrible slowdown happens only if PC is left locked overnight.

PC is perfectly accessible while locked with SSH sessions and shows no noticeable signs of slowdown, so this must be a desktop UI issue.

How can I find out what's going on and prevent this from happening?

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I've had a similar problem that seemed to be down to Firefox. Perhaps experiment with shutting down FF and see if Ubuntu comes back to life properly? – Thorsen Aug 7 '12 at 11:14
When it's running slow, try using the top command to see what's consuming your CPU cycles and memory. – z7sg Aug 7 '12 at 11:15
what is the amount of your ram and swap? Please provide the output of this command " cat /etc/sysctl.conf | tail " – shantanu Aug 7 '12 at 11:21
@Thorsen, either you're right or I'm in luck. When I closed Firefox before leaving and came back next day, system unlocked without any noticeable delays. – Oleg V. Volkov Aug 8 '12 at 9:59

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