Why is rendering bad on the second monitor and how to fix it?

Question

NVIDIA

Mint system (and on ubuntu too), laptop with intell and nvidia 650 graphics cards.
The new kernel made support for optimus, using the proprietary nvidia 331 driver.
When a monitor is connected via VGA, when scrolling, for example, browser pages, they are rendered poorly, the old image is superimposed on the new one diagonally. Everything is fine on the main monitor
. On the old kernel, this did not happen when you could not use nvidia

Answer 1

Nvidia could be used for a very, very long time, I have a laptop with Nvidia 780M.
Install bumblebee. Run all applications through Intel as usual, and games through bumblebee:
As an example. As a result, if necessary, a discrete card will be used.
Well, the driver is old, install 346 from the xorg-edgers repository, how to do it is easy to find (this driver itself is worth it).
You can start simply by updating the driver.