I have the Asus PA248QV, running at 1920x1200 @ 75 Hz as the primary display on Linux Mint while I'm typing this.

Indeed if I go to the Display Settings, and lower resolution from 1920x1200 to 1920x1080, the display only offers 60Hz output.

Same with 1600x1200 output: only 60Hz is offered.

Here's a full list of resolution + refresh rate pairs that Linux Display Settings widget offers me:

11920x1200    74.93Hz 59.95Hz
21920x1080    60.00Hz 59.94Hz 50.00Hz 30.00Hz 25.02Hz
31600x1200    60.00Hz
41680x1050    59.95Hz
51280x1024    75.02Hz 60.02Hz
61440x900     59.89Hz
71280x960     60.00Hz
81152x864     75.00Hz
91280x720     60.00Hz 59.94Hz 50.00Hz
101024x768     75.03Hz 70.07Hz 60.00Hz
11800x600      75.00Hz 60.32Hz 56.25Hz

So indeed there is a restriction that 75Hz is only offered at the max refresh rate.

This must be the list of video modes programmed into the EDID table. I have no idea why they do not support 75Hz on the lower video modes.

CRT Terminator DV1000 ignores the EDID, and pushes out DVI-D video based on the input DOS mode. In my tests from generating a video mode from FPGA, the only restrictions I can recall, are:
- on HDMI input, output video width resolution must be > video height resolution (so DOS hack video modes like 256x256 or 512x512 are not supported. CRT Terminator sidesteps this by outputting 512x256 and 1024x512, and relying on 4:3 aspect)
- 50Hz <= refresh rate <= 75 Hz
- hsync >= 31.0 kHz

Giving a quick test with what I have at hand, I was able to output the following video modes from CRT Terminator to the Asus PA248QV:

11024x768     50.001Hz
21024x768     69.965Hz
31280x960     71.997Hz
41280x1200    70.362Hz
51600x1200    70.362Hz
61600x1200    73.001Hz

The refresh rates are the maximum output from Hercules Stingray Pro ARK1000PV DOS card happens to be. Unfortunately it does not output 75Hz in any mode, though I am pretty sure I have output 75Hz from a wide range of lower resolution modes than 1920x1200.

The PA248QV does not do refresh rates above 75Hz, but I can't recall it ever not being able to do 75Hz in lower resolutions. e.g. 640x480 75Hz, 800x600 75Hz should be possible.

From my CRT Terminator resolution test/validation charts at https://oummg.com/manual/adapters.html, I see that I have output:
- 800x600 75Hz: https://oummg.com/manual/imgs/SpeedStar64_CL- … 00@75p-256c.png
- 1024x768 75Hz: https://oummg.com/manual/imgs/CL-GD5446/WIN3. … 7MHz-stable.png

which I am 100% sure the ASUS PA248QV was able to display.

The above information are all from the HDMI input.

As for the VGA input, I have not used that side as much. The display has "4:3", "Full" and "OverScan" aspect ratio control modes.

In 4:3 modes from HDMI, the 4:3 control is not fixed, but an "intelligent 4:3", where the video output is shown as 4:3 only if the input video mode has an aspect ratio < 16:10. If the aspect ratio is >= 16:10, then the output is always shown as 16:10.

But naturally when viewing via VGA, such an aspect ratio determination cannot be made (as VGA video is continuous and does not have a horizontal resolution), so it could be that in VGA mode the 4:3 aspect ratio control is fixed, or based on some intelligent vertical # of scanlines detection only.

Thankyou for testing!

So, am I to understand that you can (somehow) actually make this monitor show a picture (and work normally) at these higher resolutions when the input signal comes as above 60hz ?
Noticing this bit here:

11024x768     50.001Hz
21024x768     69.965Hz
31280x960     71.997Hz
41280x1200    70.362Hz
51600x1200    70.362Hz
61600x1200    73.001Hz

But you have to use some EDID black magic (ignoring) for that to happen ?
(as in, you need some kind of overriding apparatus between the monitor and the source)
If so, that is disappointing/annoying.
.
As for resolutions below 1280x, everything seems quite dandy though, judging by that modes table. But I still wanted to have slightly better refresh rate on the higher ones as well.
As I experienced 60hz to be less desirable when using my ancient Dell 2209WP at 1280x960 (4:3) etc. And my personal preference is that 1920x1200 is a bit too much/small anyway for a 24inch monitor.

The resolutions in question (picture from ASUS manual):

bestemor wrote on 2025-11-29, 22:32:

But you have to use some EDID black magic (ignoring) for that to happen ?

I wonder if the Custom Resolution Utility on Windows is still functional: https://www.monitortests.com/forum/Thread-Cus … ion-Utility-CRU

That used to be the go-to mechanism at least way back to force custom resolutions that the display did not advertise via EDID.

On Linux, iirc, one would set up custom "modelines": https://askubuntu.com/questions/377937/how-do … stom-resolution

With my tests with CRT Terminator, it ignores all the EDID stuff, and just pushes a specific DVI-D mode resolution out to the display. The display then either shows a picture, or doesn't.

There are no mechanisms in a display itself to first configure/enable a display mode. I.e. Custom Resolution Utility and modelines configure the PC graphics adapter to output a specific video mode. The display just passively either accepts or rejects it.

Apparently there is a gen 2 called PA248QFV. One of the updates is 100Hz support. I might order it.
https://www.asus.com/us/displays-desktops/mon … -gen2-pa248qfv/

valnar wrote on 2025-12-01, 15:31:

Apparently there is a gen 2 called PA248QFV. One of the updates is 100Hz support. I might order it.
https://www.asus.com/us/displays-desktops/mon … -gen2-pa248qfv/

Unless I'm missing something, that updated model no longer seems to have VGA input.This makes is less useful for retro gaming on older systems (Win9x).

Of course, if you have a DVI capable GPU, you might be able to use a passive DVI to HDMI adapter. But for pure VGA cards, this newer version of the monitor isn't a great choice.

Oh dang. How did I miss that. OK thanks.