Diego_Intel wrote:
puppy, in your case, you may need to check on this directly with your Original Equipment Manufacturer, Lenovo and open a Service Ticket with them so they may check directly on this.
It is almost hopeless since it is a corner case on an older machine. It would result in try this ..., try that .... replace this ..., replace that. No attempt to actually diagnose the issue 
Moreover the issue affects only people who can not stand any kind of anti-aliasing on todays low DPI diplays as described here: Anti-aliased fonts hurt eyes and damage eyesight.
Do you have an idea whether the Intel video driver 9.x version contains code/feature/functionallity that might cause this and got activated in the new driver version ? I can not imagine it is caused by a hardware setting of the display component.
Again, enabling a video driver debug log would be the best way, if there is any.