Cant set more than 85hz at external monitor using minidisplay port with 1.4 DP cable

[Leon_Huk]

Hey Guys,

I cant get more than 85Hz at external monitor conected to HP omen 15 2020 - 4600h with 1660Ti - Latest bios and drivers.

Im using mini dispaly - to dispaly port cable rated as DP1.4

https://www.amazon.se/Cable-Matters-DisplayPort-DisplayPort-kabel-1-4-kabel/dp/B07R6P3P5K/ref=sr_1_1...

- my monitor is 35in AOC 3440x1440 AG352UCG

I can see 100Hz option  but after changing to 100hz screen turn off with no signal. 

I had the same preblem with DP1.1 cable - why is not working after changing to Dp1.4 cable ? 

Any thoughts on that ? 

[Echo_Lake]

@Leon_Huk

Thank you for posting on HP Support Community.
 

Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:  

• When using Windows 10, you can start the process by opening your "Settings" and clicking "System."
• Then, select "Display" and navigate to your "Advanced display settings" tab where you’ll find a link marked "Display adapter properties" for Display 1.
• From there, click to the "Monitor" tab and you should see a dropdown below a field labelled "Monitor settings." Simply select your desired refresh rate from the dropdown and click "Apply."

Alternatively, you can just right-click on your desktop and select "Display settings" in order to access your" Advanced display settings" tab.
 

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

[banhien]

@Leon_Huk 

The specs of your machine is

         https://support.hp.com/id-en/document/c06679732

It has one miniDisplay port 1.4 which supports 7680 x 4320 / 60 Hz / 10 Bit Chroma / HDR  or 3840 x 2160 / 120 Hz / 10 Bit Chroma / HDR.

You already know: refresh rate goes up will drive resolution down and vice versa. Your monitor has native resolution 3440x1440, in theory you should be able to get more than 85Hz but actual situation the number would be less.

Does your monitor have USB-C port ? If yes, USB-C connection may give you better result.

Regards.

[Photoray002]

Just stopped by and wanted to also add....

I read where that AOC model had issues with flickering and/or blacking out completely at 100Hz when it came out in 2017 and some say it continued to be this way.

1. Go into the Nvidia Control Panel and change Gsync to off (if you have it enabled). If no joy, turn it on. What happens?

2. Next, try the OSD panel on the monitor itself and set overdrive under Extras to its highest setting, then lowest setting. What happens?

3. It might very well be a bad HDMI cable also.

4. Some stated that swapping to HDMI and then back to DP (with Gsync off) would make it work again. If this is the result for you also, then its a bad monitor. IDK if its the motherboard or a faulty DP connector, but AOC would have to correct it.

If none of the above make any difference, are you with-in the time frame to contact AOC about a warranty issue?

[Leon_Huk]

Thanks for the answer. 

Regarding your comments: 

1 . Gsync of / on do not have a impact on available refresh rate, in both cases there is no signal after changing to 100Hz

2. Whatever I choose there is no signal after changing to 100Hz.

3. Most probably - I'm using chinese mini Dp cable rated as 1.4 ID E344977-Q - trying to verify if this is a true Dp1.4 but no success, hard to contact the manufacturer.

4. Monitor is connected to the desktop and there is no problem to use full 100hz and it works from the beginning. 

I have to test this cable on a different configuration but since this is a minidiplay port I don't have any other device. 

I will get back after verifying if this is a true DP1.4 and cable.

Many Thanks

Leon