http://ubuntuhandbook.org/index.php/...-ubuntu-14-04/
When a relative running Kubuntu 14.04 brought by her computer she said the problems started when she had the lid set to put the computer to sleep while on battery. As long as she left her laptop plugged in she didn't have any problems. When she opened her lid things came back as normal. However, unplugged and running on battery, when she closed the lid her laptop went to sleep ok, but then the battery drained and the computer shut off due to lack of power while in the sleep mode. When she turned it back on the wireless wouldn't come back up an she had video problems.
Hibernate powers down the computer. Sleep is suspending to RAM, but not powering down. In the sleep mode video shuts off and the disk stops spinning, the CPU goes to minimum, but applications remain in memory which is kept powered.
I never used either sleep or hibernate, but after my relative's experience I have set Power Management, when on battery, to shut down the computer when the remaining battery power drops below 5%, or I close the lid.
Also, I choose to start with a clean desktop. IF I wanted to have the applications which where running when I shut down to return to the screen when I power up I would set the desktop to restore the previous session. Since I never use the "restore to previous session" I do not know if an app, say LibreOffice, would open up to the document I was using at the time or not.
Hibernate is disabled by default in Ubuntu. When the computer hibernates, all of your applications and documents are stored and the computer completely switches off so it does not use any power, but the applications and documents will still be open when you switch on the computer again.
Hibernate powers down the computer. Sleep is suspending to RAM, but not powering down. In the sleep mode video shuts off and the disk stops spinning, the CPU goes to minimum, but applications remain in memory which is kept powered.
I never used either sleep or hibernate, but after my relative's experience I have set Power Management, when on battery, to shut down the computer when the remaining battery power drops below 5%, or I close the lid.
Also, I choose to start with a clean desktop. IF I wanted to have the applications which where running when I shut down to return to the screen when I power up I would set the desktop to restore the previous session. Since I never use the "restore to previous session" I do not know if an app, say LibreOffice, would open up to the document I was using at the time or not.
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