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> **Possible Duplicate:**  
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> [How well do laptops with Nvidia Optimus work?](https://askubuntu.com/questions/36930/how-well-do-laptops-with-nvidia-optimus-work) 
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i upgraded ubuntu to 12.04, i have lenovo ideapad with GT540M 2GB graphic card, 2nd gen i5 processor.
when i installed nvidia drivers, screen resolution changed to 640X480, can nvidia drivers be installed, coz i have tried many ways and took help of almost all discussions on this site. is this problem of optimus or anything else. please help me out.