Just a quick post.
I recently did a fresh install of Ubuntu 17.04 on my Ubuntu PC which has an nVidia GTX 1050, and on the fresh install I no longer had 2560×1440 as a display option for my Dell U2713HM monitor. In fact, I was limited to a maximum of 1920×1080
Various searches on the internet have revealed the following key facts, which in the spirit of DataHamster I record here for posterity.
- The Dell U2713HM has inputs for VGA, HDMI, DVI, and DisplayPort, so you have a lot of choices.
- You must use a dual link DVI cable if you want 2560×1440, and your graphics card must also support dual link. If not, the most you will get is 1920×1200 (although the maximum I was presented with was 1920×1080). I tried both a Dual Link cable and also a Dual Link DVI to HDMI cable, but neither worked for me. Perhaps the GTX 1050 doesn’t have Dual Link on its DVI output or perhaps my DVI to HDMI cable was not dual link.
- The HDMI input on the Dell U2713HM is apparently only HDMI v1.3, and although the HDMI specs say that the maximum resolution of v1.3 is 2560×1440, some comments suggest that this is an issue for this monitor. The more expensive Dell U2713H has v1.4 on its HDMI input, apparently.
- The DisplayPort input worked fine and instantly gave me the full 2560×1440 resolution.
Some comments suggested using xrandr to make a new custom resolution, but this didn’t work for me. Instead I got the dreaded “low graphics memory” error after reboot, both with DVI-to-DVI and HDMI-to-DVI.
So, in conclusion, I would suggest using the DisplayPort input on this monitor if at all possible. Or, if your graphics card does not have DisplayPort, then use the DVI input of the monitor.
