Custom Resolution Utility (CRU)

[Beagle]

(03-14-2019 12:15 AM)ToastyX Wrote:  

(03-13-2019 08:41 PM)Beagle Wrote:  I have a problem that has led me to this thread - I've just upgraded all my hardware except for my old Apple Cinema Display 30" which has a native res of 2560x1600 and that I've been using on 1920x1200 for the past couple of years. For reasons that remain a mystery to me, the new system is using a res of 1280x800 and I can't seem to get it any higher.

I'm connecting the display via a DVI (dual link) to DisplayPort adapter to my RTX2080, and I've updated my drivers for the card which I initially thought would solve the problem.

I've managed to set-up a new profile in CRU, pressed OK, reset.exe, went to display settings and selected the new resolution, the display goes black for a few seconds during which time the power button on the display flashes intermittently as if it is working, when the picture reappears it defaults back to 1280x800.

It sounds like you have a single-link DVI adapter, not dual-link. A dual-link DVI adapter would have a USB connection for power like this: https://www.amazon.com/dp/B00856WJH8/?tag=mtests-20#ad

The 30" Apple also doesn't have a scaler, so it only supports 2560x1600 and 1280x800 natively. The graphics driver automatically adds some common lower resolutions as scaled resolutions, which is how you had 1920x1200 before, but without 2560x1600 available, it only adds resolutions lower than 1280x800. When you add 1920x1200 with CRU, you're adding a non-scaled resolution that's sent to the monitor, but the monitor doesn't support 1920x1200, so you get a black screen. You need to get a proper dual-link DVI adapter. Then 1920x1200 will probably be available automatically without needing to use CRU.

This solution worked great for me and I never would have found it without you. Thanks for your help. My donation is scheduled for the beginning of April. Keep up the great work.