Try fullresolution=0x0 or fullresolution=1920x1080. 0x0 means desktop resolution.

ripa wrote:

Try fullresolution=0x0 or fullresolution=1920x1080. 0x0 means desktop resolution.

Sorry, I tried these before making the post. I didn't realize I hadn't mentioned that in the post.
Will update to include this.

-Finchley Minsk, draws mustaches in newspapers

Look through your monitor OSD controls and your video card driver options.

I'm truly sorry. Once again I took for granted something about my post.

I have gone through my OSD settings as well as my video driver options prior to making the topic; to no avail.
I will update the topic to reflect this.

I want to say I appreciate any and all help and advice offered in this thread.
You're awesome, you!

-Finchley Minsk, uses lactose intolerance like a super power

Hello, I am sad to say I have not yet resolved this issue.

I, a light-hearted, happy-go-lucky fellow, am deeply saddened.

Yo dawgs,

Be trues when I says, only surface works decently fullscreen.
Direct3d and Opengl, straight up nopes in this hizzay.

digs bruvs?

Seriously? No one has anything to contribute?
I thought that the DosBox devs were on here, yet not one has the slightest interest in fixing a fault in their code?

"I haven't the slightest idea. Better ignore it and hope this is an isolated incident"

Shame on you.

Lol.

I doubt there's anything wrong with Dosbox, since this is only occurs with your external display. If there's a problem, it's probably with your external display or graphics driver settings (you have not mentioned which graphics hardware you have - Intel, AMD, Nvidia, which model, which drivers, etc...). It's also possible that there's a bug in SDL, the library that Dosbox uses for graphics output. Have you tried other SDL-based applications?

Here's a few more shots in the dark.
1. Disable the external display's aspect ratio "auto-crop" feature.
2. Disable overscan in the external display's settings.
3. Disable overscan in your graphics driver settings.
4. Disable or enable or adjust any other settings like GPU scaling.
5. Upgrade or downgrade your video card drivers.
6. Try a different version of the SDL DLL.
7. Make sure you try a game instead of just the command line because text mode and graphics mode behave a bit differently in Dosbox.
8. Try a different video output port (e.g., VGA, DisplayPort, HDMI, DVI).

If these don't help, get the Dosbox and SDL source code and build the software and debug the problem yourself. Debug prints are always helpful.

If something like this sinple fullscreen is wrong for only ONE user the chances are the fault is not Dosbox'...

Finchley Minsk wrote:

Shame on you.

Yes sir, now that you, a light-hearted, happy-go-lucky fellow, have exposed what terrible people we are we will reveal the secret solution we have been keeping for this problem no one else has heard of. May $deity have mercy on us all.