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Why are the options for suspend/hibernate not there or I can not select them?

There are many possible reasons, for example your kernel could be compiled without suspend/hibernate options. It could also be that you don't have the right permissions to use them.

I have put my computer into suspend or hibernate mode, but the computer is not waking up.

This was the subject of many bug reports. Please note that the power manager has nothing to do with these problems, since the kernel is responsible for these tasks. The kernel team is putting a lot of efforts into fixing these kind of problems, however, if you still have problems please report a bug to your distributor and hopefully they can contact the kernel team and possibly provide a work-around.

Power manager fails to blank screen after inactivity timeout

The reason for this bug possibly is caused by an application, sending a signal to prevent the screen from sleeping. E.g. chromium does so when it assumes that a video is running. Check this page for debugging help.