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First, check your graphic card name and chipset: sudo update-pciids #optional command, requires internet lspci -nn | grep VGA It should report something like this for your graphics card: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV710 [Radeon HD 4550] then you can check that is your graphic card is fully supported of not ...


I too had this problem after upgrading to 14.04 The solution mentioned here worked wonders for me, https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1278012/comments/12 A workaround for ubuntu 14.04 with nvidia driver is to disable backing store in xorg: Make sure you have the "-bs" option in lightdm config file: cat ...

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