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outliner · 04-04-2019, 08:31 AM

(04-02-2019 05:29 PM)ToastyX Wrote:
(04-01-2019 08:51 AM)outliner Wrote: ive been having an issue after trying to set my tv to 120 hz native on my dual screen setup. this is to achive my goal of having my pc output a 12 bit color signal with 120hz. the problem is that when ive set everything up and shutdown my tv. my other monitor randomly starts to flash a black screen serveral times at a time. im completly clueless why this is happening and its very frustrating for me. anyone that can help? ive been searching for anwers without any luck.
What video card do you have? When you say the monitor flashes a black screen, how long does it do this? Does it stop after a few seconds or does it continue indefinitely?

GTX 1080 the flash is lasting for like 2 seconds, then it comes back as normal for like 5 seconds. i think it flashes indefinitely i didnt let it go on for more than 3 "flashes"

***ToastyX*** · 04-04-2019, 05:56 PM

(04-04-2019 08:31 AM)outliner Wrote: GTX 1080 the flash is lasting for like 2 seconds, then it comes back as normal for like 5 seconds. i think it flashes indefinitely i didnt let it go on for more than 3 "flashes"

It sounds like the TV is reconnecting every few seconds when it's off, so the video card thinks a monitor is being plugged in every few seconds. Either that or there's a driver bug maybe related to SCDC, but I think it's more likely a problem with the TV, especially if the flashing stops if you physically disconnect the TV.

***ToastyX*** · 04-04-2019, 05:57 PM

(04-03-2019 12:50 PM)beenlagged Wrote: Is there a possibility that I could achieve higher refresh rate overclock using a dual link DVI-D?

No, the monitor doesn't use dual-link DVI.

(04-03-2019 12:50 PM)beenlagged Wrote: Also, is there a rule or something when overclocking the monitor's refresh rate? Like should the refresh rate be divisible by 30 or 24 or 4?

No, refresh rates are arbitrary.

***ToastyX*** · 04-04-2019, 05:58 PM

(04-03-2019 02:03 AM)Dogway Wrote: Do you know of any command line or gui based program to find current display refresh rate? Currently I'm using some web tests and retroarch internal options but I don't entirely trust them.

That depends. Are you trying to calculate the actual hardware refresh rate (example: 59.637142 Hz), or do you want the currently set refresh rate (example: 59.637 Hz), or do you want the currently listed refresh rate (example: 60 Hz)?

For calculating the actual hardware refresh rate, this works reasonably well with Chrome (give it a minute to average the samples): https://www.displayhz.com/

Dogway · 04-04-2019, 08:58 PM

Yes, I meant the hardware rate which is a more accurate representation of what's happening. I was using http://www.vsynctester.com but it says Firefox is inaccurate or something, in Vivaldi (Chromium) the tester object doesn't load.

***ToastyX*** · 04-04-2019, 10:24 PM

(04-04-2019 08:58 PM)Dogway Wrote: Yes, I meant the hardware rate which is a more accurate representation of what's happening. I was using http://www.vsynctester.com but it says Firefox is inaccurate or something, in Vivaldi (Chromium) the tester object doesn't load.

It's working for me with the latest version of Vivaldi. I don't know if there's a desktop app that does the same. I might have to make one.

beenlagged · 04-04-2019, 10:49 PM

(04-04-2019 05:57 PM)ToastyX Wrote:
(04-03-2019 12:50 PM)beenlagged Wrote: Is there a possibility that I could achieve higher refresh rate overclock using a dual link DVI-D?
No, the monitor doesn't use dual-link DVI.

(04-03-2019 12:50 PM)beenlagged Wrote: Also, is there a rule or something when overclocking the monitor's refresh rate? Like should the refresh rate be divisible by 30 or 24 or 4?
No, refresh rates are arbitrary.

I see, thanks for replying!

How did you know that the monitor doesn't use dual-link DVI? I've searched the spec sheet of the monitor and it's panel but I couldn't get such info. Knowing how would be a great help in the future.

Also, besides choosing between the LCD options (standard, native, reduced) what option or value should I tweak to get better timings or higher refresh rate?
Front porch? Back porch? Blanking? Sync width?

Thanks again!

***ToastyX*** · 04-04-2019, 11:39 PM

(04-04-2019 10:49 PM)beenlagged Wrote: How did you know that the monitor doesn't use dual-link DVI? I've searched the spec sheet of the monitor and it's panel but I couldn't get such info. Knowing how would be a great help in the future.

There's no reason for a 1920x1080 @ 60 Hz monitor to support dual-link DVI because that would require including a second TMDS transmitter, which wouldn't be used at that resolution.

(04-04-2019 10:49 PM)beenlagged Wrote: Also, besides choosing between the LCD options (standard, native, reduced) what option or value should I tweak to get better timings or higher refresh rate?
Front porch? Back porch? Blanking? Sync width?

The timing parameters don't really matter as long as it works. When trying refresh rates that the monitor doesn't officially support, there's no way to know what timing parameters will work without trial and error because it's usually a monitor firmware limitation, not a limitation of the panel itself. Usually it's a refresh rate limit in the monitor or a pixel clock limit that gets in the way, not anything specific to the timing parameters. Most monitors don't allow more than 77 Hz, so be glad that you can get 87 Hz.

beenlagged · (Last edited: 04-05-2019, 12:23 AM by beenlagged)

(04-04-2019 11:39 PM)ToastyX Wrote:
(04-04-2019 10:49 PM)beenlagged Wrote: How did you know that the monitor doesn't use dual-link DVI? I've searched the spec sheet of the monitor and it's panel but I couldn't get such info. Knowing how would be a great help in the future.
There's no reason for a 1920x1080 @ 60 Hz monitor to support dual-link DVI because that would require including a second TMDS transmitter, which wouldn't be used at that resolution.

(04-04-2019 10:49 PM)beenlagged Wrote: Also, besides choosing between the LCD options (standard, native, reduced) what option or value should I tweak to get better timings or higher refresh rate?
Front porch? Back porch? Blanking? Sync width?
The timing parameters don't really matter as long as it works. When trying refresh rates that the monitor doesn't officially support, there's no way to know what timing parameters will work without trial and error because it's usually a monitor firmware limitation, not a limitation of the panel itself. Usually it's a refresh rate limit in the monitor or a pixel clock limit that gets in the way, not anything specific to the timing parameters. Most monitors don't allow more than 77 Hz, so be glad that you can get 87 Hz.

Gotcha, thank you very much ToastyX!

One last thing. As you said that most monitors don't allow more than 77 Hz, does running it at a high overclock of 87 Hz from 60 Hz dangerous at the long run?

***ToastyX*** · 04-05-2019, 04:05 AM

(04-05-2019 12:16 AM)beenlagged Wrote: One last thing. As you said that most monitors don't allow more than 77 Hz, does running it at a high overclock of 87 Hz from 60 Hz dangerous at the long run?

There's no way to know for sure how it would affect the lifespan of the monitor, but I haven't seen any significant issues with running higher refresh rates for long periods of time. For example, many people have been running the Catleap/QNIX monitors at 96+ Hz for several years without issues. I've had mine for 7 years.