Why Does Ubuntu 9.10 Go Into Hibernate a Minute After Unplugging the Power Supply?
Ubuntu 9.10 features different power-saving options that you can use to save your computer's energy and battery power, including hibernate mode. The power-saving options allow you to quickly return your computer to the state it was in when you last stopped using it.
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Hibernate and Other Power-Saving States
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To understand hibernate mode in Ubuntu 9.10, it is helpful to understand the other power-saving options. In standby mode, your computer's central processing unit keeps running, but the hard drive and monitor turn off. In addition to turning off the hard drive and monitor, suspend mode turns off the CPU. Hibernate mode saves more power than the other options as it turns off the entire computer. Your current state is written to the hard disk and recalled when you turn on the computer again.
Power Settings
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Ubuntu 9.10 allows you to determine how your computer consumes power. In the Power Settings menu, you can set at what point your computer will enter the different power-saving states. You can set options for AC power and battery power. By default, Ubuntu 9.10 is set to put your computer into hibernate mode when your battery power is critically low. This allows the computer to shut down in a way that doesn't cause you to lose any unsaved work.
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Fixing Issues
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If your computer enters hibernate mode when you do not want it to, you can change the options in the Power Settings menu. If that doesn't fix your problem, then you may have an issue with a bug in the upower package. When you first unplug the computer, the bug tells Gnome Power Manager that your battery is using too much power and has entered a critical state. Gnome Power Manager then starts the hibernate mode. You can work around this bug by typing, "gconftool-2 --type bool --set /apps/gnome-power-manager/general/use_time_for_policy false" in Ubuntu 9.10's terminal.
Other Considerations
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If you have a second battery for your computer, try using it to see if you have the same problem. Your computer's battery might be failing. If the second battery works better, then your original battery is getting too old to use. Ubuntu 9.10 reached the end of its support cycle in April 2011. If you develop any further problems with the power settings, or any other issue, you will not be able to get official support for the problem. You should upgrade to a supported version of Ubuntu.
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