Ubuntu – How to figure out why Suspend sometimes fails


Something is causing suspend crash occasionally. When it does crash, the system freezes with a black screen and stays on, not suspending. This makes me have to hold the power button until the system shuts down.

One setting difference I have from most people is, I don't use the option that lets you suspend when the laptop lid is closed. So opening and closing the laptop lid has no actions. I like to press suspend manually. Could this preference change be the cause?

How can I start looking for what's causing the crash, since the crash doesn't display errors?

Best Answer

No, disabling the "suspend on lid close" function cannot affect manual suspend.

You would start by looking at the output of dmesg and the contents of /var/log/kern.log and /var/log/syslog for clues.

We can try to help if you share these with us. See this question for how:

How can I easily share the output of a command or a text file with others?

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