1080p output on a 4K monitor: full-screen terrible, windowed somehow fine

BakoBitz

Commendable
Jun 19, 2016
4
0
1,510
I got a 4K monitor last year, and it's been great generally, except for games like my heavily modded Skyrim that won't run in 4K at acceptable framerates. For those, when the monitor shifts to 1080p resolution in full-screen mode, the contrast becomes dramatically washed out and weak. It's very noticeable and disappointing.

Seemed like a monitor hardware issue, so I just accepted it, but recently I got a mod that forces the game to run in a borderless window instead of 'full screen.' Since running it at 4K is out, and the mod just uses the desktop resolution, I tried changing the desktop to 1920x1080 before running the game, and guess what? No contrast problems at all, despite still being in 1080p.

Is there something different about running a game in "fullscreen" mode, as opposed to a borderless window, that would affect how the signal is sent to the monitor, or the way the monitor handles the resolution change? I should add that running skyrim fullscreen at 4K looks fine -- no contrast problems -- it's just full screen at lower resolutions.

I don't want to have to manually change the desktop resolution every time I play Skyrim, so if anyone knows what might be going on, and if there's a solution for avoiding the contrast problems in 'full screen' mode, I'd appreciate your thoughts.
 
Solution


That's because it's not your monitor doing the scaling via desktop, it's WDM (Windows Desktop Manager).

Just out of curiosity, are you sure you have your monitor in best mode for gaming (1:1)?

BakoBitz

Commendable
Jun 19, 2016
4
0
1,510


Thanks for your reply. It's not a big deal, I just need to switch the desktop resolution of Windows to 1920x1080 whenever I play the game, and back when I'm done. It's annoying, but beyond that, I usually have a Skyrim game running on my system at any given time, and alt-tab out of it to get work done, browse the web, etc. That worked in full-screen mode, since it snapped the resolution back and forth automatically, but if I do it now, I've got a blurry desktop in which everything is enormous (I have scaling set to 175%).

The other reason I'd like to get to the bottom of this is the mystery: the monitor is fine at scaling when it's happening through the Windows desktop, but when receiving the 'full-screen' signal, somehow becomes terrible at it. I know full-screen mode bypasses Windows and directly addresses video output, so I'm wondering where the signal gets messed up. Maybe somewhere in the graphics drivers (Nvidia) there's a solution?
 


That's because it's not your monitor doing the scaling via desktop, it's WDM (Windows Desktop Manager).

Just out of curiosity, are you sure you have your monitor in best mode for gaming (1:1)?

 
Solution

BakoBitz

Commendable
Jun 19, 2016
4
0
1,510


You mean when it's in full-screen? I tried tweaking everything I could find and created a separate profile for it, but it made little difference. It's like the black level was raised to a 50% gray. I'm not sure what you mean by 1:1 though, and looking through the settings again I'm still not sure.
 

BakoBitz

Commendable
Jun 19, 2016
4
0
1,510
p.s. How is it different with WDM doing the scaling? In either mode, the monitor reports receiving a 1920x1080 signal. Even if fullscreen bypasses WDM, isn't it sending the same information to the monitor that WDM would (i.e. a 1080p signal)? It seems to me the monitor has to scale both signals to 2160p.
 
1:1 means one to one pixel mapping. Most modern displays have various modes you can put them in. One to one just means the pixels of the source content aren't AR adjusted.

Note also that anytime you are in windowed mode, even if borderless, the OS does the scaling, not the monitor. First you need to make sure your display is in the best mode though.

What brand and model of monitor are you using?