Just downloaded elementary os, installed an nvidia driver 455. In X Server Settings I set up 144hz for my primary monitor and 60hz for my secondary one. Now all I can see is my pointer displays at 144hz, but the everything else is only 60hz. As I know 144hz must work fine in some fullscreen apps or games. I have tried adding a new variables to /etc/environment. There is a confirmed bug report in ubuntu forum, but I saw some guys are fixing it somehow. If I will unplug my second (60hz) monitor, the first one will work properly. Do you have any ideas?