[SOLVED] Is it possible to force 50Hz?

[Windfisch]

I am using the Eizo EV2785 monitor on a RTX2080 card, connected via DisplayPort. The monitor, for some reason, doesn't communicate it can handle 50Hz modes, winuaebootlog only shows:

0: 640x480, 32-bit (59,60)
1: 720x480, 32-bit (59,60)
2: 720x576, 32-bit (60)
3: 800x600, 32-bit (60)
4: 1024x768, 32-bit (60)
5: 1152x864, 32-bit (60)
6: 1176x664, 32-bit (59,60)
7: 1280x720, 32-bit (59,60)
8: 1280x768, 32-bit (60)
9: 1280x800, 32-bit (60)
10: 1280x960, 32-bit (60)
11: 1280x1024, 32-bit (60)
12: 1360x768, 32-bit (60)
13: 1366x768, 32-bit (60)
14: 1600x900, 32-bit (60)
15: 1600x1024, 32-bit (59,60)
16: 1600x1200, 32-bit (60)
17: 1680x1050, 32-bit (59,60)
18: 1920x1080, 32-bit (29,30,59,60)
19: 1920x1200, 32-bit (60)
20: 1920x1440, 32-bit (59,60)
21: 2048x1536, 32-bit (29,30,60)
22: 2560x1440, 32-bit (59,60)
23: 2560x1600, 32-bit (29,30,60)
24: 2880x1440, 32-bit (29,30,60)
25: 3840x2160, 32-bit (29,30,60)
26 display modes.

I know the monitor CAN do 50Hz (Connecting a Raspberry Pi via HDMI, setting it to a 50Hz mode works).

Is it possible to force WinUAE to allow a 50Hz mode even if it thinks it is not available?

EDIT: For nVidia cards, it IS possible. The resolution has to be defined in the graphics driver.

I found a guide on how to create a custom resolution here: https://devanswers.co/nvidia-geforce...om-resolution/

I created 720p50, 1080p50 and 4K50 there and now they show up in WinUAE.

[Retroplay]

Use HDMI instead of DVI and problem should be solved.

[Retro-Nerd]

Yep, the manual confirms it. Use HDMI connection and a 2160p or 1080p resolution.

[Mikerochip]

You can use CRU.

https://www.monitortests.com/forum/T...on-Utility-CRU

[Retro-Nerd]

This doesn't work via Display port with this monitor. HDMI though supports 50Hz.

[DamienD]

...and thread renamed for you

[Windfisch]

As I already wrote, I solved it by defining custom screen modes in the graphics driver. The HDMI port is occupied by the Mixed Reality headset and with HDMI I never get more than 30Hz in 4K, so I use DisplayPort. It does accept 50Hz modes but just doesn’t communicate them.

[Retro-Nerd]

It accepts the real 50Hz only via HDMI. It is that simple, believe me. No matter what custom resolutions you built, or Windows shows to you, only the OSD of the monitor is important. If it says "50Hz" or "49.xx" there you get the real 50Hz output. My monitor can do 50Hz via DP and HDMI. But that's not a standard though. So, WinUAE can't do anything on the software side.

The HDMI port is occupied by the Mixed Reality headset and with HDMI I never get more than 30Hz in 4K, so I use DisplayPort.

2160p@60Hz via HDMI is possible though.

1. Get a proper HDMI premium high speed cable which supports the 18.xx GBit/s rate and makes 50-60Hz possible.
2. With 2160p@10bit you only get 30Hz in "PC RGB Pixel Format 4:4:4" driver setting. 4:2:2 YCbCr should work fine though in 10bit@50/60Hz. A bandwith limit which HDMI 2.1 will fix. Oh, and 4K@60Hz in 10bit needs at least HDMI 2.0a. Otherwise you are also stuck with 30Hz.

[Windfisch]

Defining that resolution in the DRIVER overrides what the monitor reports, that custom resolution gets reported back into WinUAE, the driver forces the monitor to use it and the monitor displays it since it is technically able to do so anyway (as it does with HDMI). I just double-checked via the monitor's OSD and it shows me 50Hz as well.

So we are both right - WinUAE can't force any custom resolutions, but you can define one in the nVidia driver which WinUAE lets you use, and if the monitor can display it, you are lucky.

So far I have 720p50, 1080p50 and 4k50 and all three display fine via DP.

[Retro-Nerd]

Then it's indeed luck. But read my edit about HDMI 4K@60Hz. This should work for you too.

[Mikerochip]

Originally Posted by Retro-Nerd

This doesn't work via Display port with this monitor. HDMI though supports 50Hz.

Did you mean CRU won't work?


The only way to know is to try it.
I've yet to see it fail though.


Obviously, if the panel in your monitor can't do those refresh rates, then, it could be dangerous to use them long term, however you force them to run.



I have a Dell U2515H, and it definitely says it can't do 50hz over DP.


But, it works fine. I've 48, 50, 59, 60 and 72Hz defined as custom resolutions and they all work fine.
(And a small few more arcade resolutions)



The monitor manual says it will do 50-85Hz only through MHL, for some reason. Normal DisplayPort or HDMI will only do 60.


CRU works fine on all 18 odd monitors I've tried it on.


I've tried it with a few NEC, Dell, Belkin. AOC and Samsung monitors and all bar one Belkin worked with all the above resolutions.


The Belkin was a weird size/shape though, so, I wasn't really expecting much from it.

[Retro-Nerd]

Well the monitor user manual description and the real capability never match 100% all the time. That's true.Though i saw a few monitors that failed with custom made resolutions. I could set them but couldn't switch to them. Especially via DP and DVI.

HDMI is normally fine with 50Hz, it's firmly fixed in the HDMI standard to support it. At least for HD ready/Full HD/4K resolutions.And Windows has no problems to detect them properly.

[Mclane]

I was always told from PC day one to NOT force refresh rates on to a monitor that does not support it because it could damage the monitor...

Is this actually true though?

If it can display it from tweaking could it cause component breakdown?

Always wanted to know for sure..

[Toni Wilen]

It is possible, at least in theory because deflection circuitry (HOT, flyback, horizontal deflection coils, this also generates CRT required voltages, including high voltage) runs at hsync rate and out of spec rates (including too low hsync) can overload the system and/or generate too high voltages. Most of them have some kind of protection, at least HV overvoltage protection.

Digitally controlled monitors/TVs most likely are immune because digital parts will not allow out of spec hsync or vsync to reach the deflection circuitry.

[Mclane]

Thank you Toni...Appreciated...