I installed Ubuntu 14.04 but i am having weird problems with my dual monitors and the resolutions. I also tried Xubuntu 14.04 and was having the same problem.

I have one 32 inch LG TV with 1920x1080 and one monitor with 1280x1024 resolution.

When i first start my 32 inch gets 1360x768, if i then try to change to 1920x1080, everythings looks fine and the prompt asking me if i want to keep settings comes up and starts the countdown, but after 2 seconds my computer freezes, and after a few more seconds it reboots itself.

However, if i disable my smaller monitor first, i can change to 1920x1080 on my 32 inch without problems, but if i then activate the second monitor the same problem happens again.

in Xubuntu 14.04 i can change the refresh rate, if i run the 32 inch at 30hz or 50hz everytying works, but i would like to be able to run it at 60hz.

I'm currently running Xubuntu 13.10 without this problem. My graphics card is a ATI Radeon HD 4850.

What is causing this problem, grahpics drivers? Kernel? Xorg? And how do i solve it?