I currently have an AMD Radeon R9 270 video card and I am running ubuntu 14.10. For some reason if I turn my monitor off and go away from the computer for a few minutes when I come back and turn the monotor back on the screen stays blank. Then my montor tells me display port no signal. Any ideas. I head that there were some changes to the suspend and resume in this new version of ubuntu. Also I am using the open source driver. Fglrx has a whole other set of prolbems so I will not switch to that.