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Ubuntu screen lock freeze

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Ubuntu screen lock freeze is a OpenGL problem. Fix it by setting  ---

Install Compiz Settings Manager:
Code:
sudo apt-get install compizconfig-settings-manager
-Go to OpenGL plug-in & uncheck the Sync to VBlank option.


http://www.preshweb.co.uk/2011/05/ubuntu-11-04-x-freezing-after-screensaver-active-laptop-lid-closed/

If you are already into the fix restart X by opening a tty Ctrl+Fn > root login . Type

/etc/init.d/lightdm restart

for Ubuntu 12.04 or later or


/etc/init.d/gdm restart

for others. If you are using any other display manager then restart it instead.


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