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74701
UP3214Q no scaling and no 16:9 resolution between 1920x1080 and 3840x2160?
Since the full 4K resolution is a bit too much to ask from my poor NVidia GTX780TI (at least at high detail level), I wanted to reduce the resolution somewhat when playing games. I found, however, that there's not one single resolution between 1920x1080 and 3840x2160 that has the proper aspect ratio. Every high res Dell Model I've previously owned (WFP-3007, WFP-3008, U3011, U3014) has supported resolutions with proper aspect ratio at less than display resolution (e.g. 1680x1050 or 1920x1200), so what happened there? Going below 1920x1080 I can once again find resolutions at the proper aspect ratio (e.g. 1600x900) Also.. if I set Windows to 1920x1080, this will get me one tiny picture at the center of the screen filling just one quarter of the screen real-estate. Since the screen is filled out during the boot process (BIOS, Windows startup screen), I think it can handle lower than native resolutions just fine, yet no amount of tinkering in the OSD menu (I tried al the values in Display Settings => Aspect Ratio) managed to correct the issue. I could of course ask my GFX card to perform scaling, but I'm left wondering why once I'm logged into Windows, the only way to get the picture to fill the full screen is at native resolution.
humba
77 Posts
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December 19th, 2013 07:00
Sleep seems to be okay on the HD6970.
humba
77 Posts
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December 22nd, 2013 03:00
Although.. I may just have been lucky. I'm selling my old gaming PC so I set it up anew - Win7 instead of Win8.1 and the latest Radeon drivers that were released just 4 days ago (release 13.12), and that even brought the "dual 1920x2160 screens" issue back with all kinds of other funky stuff (at times it tells me only one display is connected and I could try sending the second signal to analog).
Interestingly, the ATI drivers loaded from Windowsupdate (something really old from 2011) didn't have those issues but the screen ran in DP1.1 mode even though it was set to 1.2 (at full res it was giving me just 24Hz).
humba
77 Posts
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August 30th, 2014 06:00
So it seems the display is capable of doing 1920x1080 and 2560x1440 at 60Hz. Here's a video showing it on Linux: ,
And here's a post indicating that 1920x1080 works in Windows on an intel card: https://communities.intel.com/inbox
So, what's the problem then?
humba
77 Posts
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September 23rd, 2014 03:00
In the meantime, I raised the issue with NVIDIA who got back to me with the following statement
We look into the 2560x1440 resolution and this appears to be a limitation on the monitor which is based on the Sharp/ASUS panel. According to development the 4K tiled based Sharp/ASUS panel has 2 operation mode: MST and SST. In MST mode, due to their firmware limitation, the monitor scalar is disabled even the source (GPU) only sends 1-stream (e.g. 2560x1440x60Hz). So in MST mode the lower-res 16:9 mode like 2560x1440 are not supported. The firmware limitation was fixed with the newer version firmware from STMicro but Sharp/ASUS didn't adopt it. When the panel is switched to SST mode (by OSD control), the monitor scaler is enabled so 2560x1440x60Hz is physically support. But since 2560x1440x60Hz is not exposed by the EDID, NVIDIA GPU driver can only make 2560x1440x30Hz because it can be stretched to 4K2K30Hz.