Depends. I&#x27;ve had a Samsung U28D590D (<a href="http:&#x2F;&#x2F;www.samsung.com&#x2F;us&#x2F;computer&#x2F;monitors&#x2F;LU28D590DS&#x2F;ZA" rel="nofollow">http:&#x2F;&#x2F;www.samsung.com&#x2F;us&#x2F;computer&#x2F;monitors&#x2F;LU28D590DS&#x2F;ZA</a>) since October 2014 with a Radeon HD 7970. Only until kernel versions 4.2-4.3 and xf86-video-ati 1:7.6 have I been able to get the DPMS to properly activate. It was maddening having to ssh and and play the prod the DPMS state until the monitor flickers back on. However, I quickly gave up on any HiDPI and desktop environments and stuck with xmonad. Works like a charm now.