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Xubuntu 14.04. After wake up from sleep, it asks to enter password. I entered the passw. and screen goes black. On Ubuntu 14.04 waking up was just ok. Lenovo E330 laptop with intel HD graphics.
add: If lid was closed, not clicked sleep

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Perhaps this bug bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/… ? –  TuKsn May 7 '14 at 22:39
I just uninstalled lightlocker and installed xcreensaver. –  Reza Jan 4 at 9:35

3 Answers 3

My Lenovo E531 does the same. I insert the password and the screen goes black. Then I press the power button, I enter the password (again!) and everything it's fine. I know it's not the answer you needed, it's just a workaround than works for me. I hope it will help you too.

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I was able to work around the problem by going into settings, opening "Light Locker Settings" and setting "Enable light-locker" to off.

Learn more about light locker at http://xubuntu.org/news/screen-locking-in-xubuntu-14-04/

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Had the same problem too. My solution was on Light Locker Settings too but I didn't disable light locker. I just enabled "Lock on suspend" and the problem solved.

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