AMD+Displayport = no dithering

reaganry

the last dithering post seemed a little overworked & I hadnt heard of anyone testing these out:
AMD/Radeon cards give you an option to turn off dithering when using a displayport cable. Just pick 6 bit vs 8 bit output and you'll see the difference immediately. There are also several other options you dont get with nvidia like 4:2:2 chroma. They dont seem to do the trick for me, but maybe they will for some folks?

JTL

reaganry Eventually when I obtain the proper hardware I will do some empirical testing.

fenix

reaganry thanks for posting this. I will try it out.
I have a BenQ BL2480T monitor (flicker free certified, no PWM), and an AMD radeon and a display port cable. I have just set it to 6 bit. I will update this post next week to report if it have worked.

CHR

Thought this article might be of interest to others. It would be interesting to know if anyone has tried this:

How do I turn off temporal dithering in an AMD graphics card? (1569)
https://help.teradici.com/s/article/1569

AgentX20

CHR Thought this article might be of interest to others. It would be interesting to know if anyone has tried this:

How do I turn off temporal dithering in an AMD graphics card? (1569)
https://help.teradici.com/s/article/1569

Pretty sure I tried those config options a while back with a Vega card without success. I don't have time to find the posts right now sorry.

The AMD displayport bit might be interesting to try but of course my old 'good' screens (2407/2410) dont' have displayport...

CHR

Thanks reaganry for this - I am testing a NVIDIA Quadro P1000 using a display port cable at the moment but can only see an option for 8 bpc under the NVIDIA colour settings - "change resolution", "output colour depth" - I wanted to check if this is what you meant?

JTL

CHR AMD and Nvidia settings aren't the same

reaganry

CHR yeah it's only on AMD cards

valex13

Did it help with an eye strain problem?

reaganry

valex13 maybe 🙂 maybe not

Sunspark

At the office on Intel I do prefer using displayport to a displayport monitor so I can certainly believe this is also helping.

reaganry

AgentX20 U2414 does 🙂
I'm very interested to hear other displayport stories.
[rx580(dp 8 bit)+U2414] is not perfectly comfortable (some fuzzy left brain tension), but somehow it immediately shifted me from feeling stoned to jump out of bed sharp & motivated.

Sunspark

reaganry That sounds like what people pay money to be able to achieve..

caoyirui

reaganry can you set it to 6 bit?

HAL9000

fenix

I now have the same monitor and also a Radeon card so I am trying this as well, I see no difference in banding between 6 and 8 bit color though so not sure its doing anything.

Personally at this time I cannot tell as I already had a headache but do you notice any difference?

hayder1983

6bit mode doesnt turn off dithering, at least not with the newest adrenalin edition.

HAL9000

It should though as it wont try to force an 8 bit signal which the monitor cant natively do as its 6+2, however even on a true 8 bit panel I get issues with moder graphics cards including my radeon card.

Either way I wasnt able to test long enough to confirm, this benq IPS monitor with its FRC 6+2 is causing me issues with other hardware (which was ok on my 8bit Benq TN) on all connections, which is strange considering my LG 6+2 FRC monitor is totally fine. Both state flicker free but they must do something differently.

I have a headache at the top/front of my head and a dizzy sensation, my head feels heavy. Its similar to how the Nvidia cards affect me but not as bad, its still very distracting though I dont think I can work like this for long.

hayder1983

HAL9000 I have a BenQ which causes me symptoms too, but my 14 year old TN-Panel didnt. But it is still better than the other monitors i own. Its possible to work with it but it gives me brain fog.

Try another flickerfree device perhaps, if you can. Perhaps a flickerfree Dell.

reaganry

HAL9000 same for me, top and on the left side. i mostly pretend it's fine bc it's better than other screens 🙁

HAL9000

hayder1983

I had hoped this 2480 being from 2017 would help, it may also be that I'm not used to IPS screens I spent most of my life with TN screens, I've only had issues with TN when it has PWM on an LED backlit.

I have significantly lowered the contrast using the langom website as reference, its not a great panel but it now mostly matches my LG IPS (which is fine for me) but it still 'hurts' to use.

I had used a Dell IPS in the past however I cannot remember the model, I believe it was also likely a 6+2 FRC screen as most IPS are.

I can only assume 'good' 6+2 IPS dither / FRC differently to 'bad' 6+2 IPS screens. I'll test it for a little longer and see what happens.

hayder1983

HAL9000 Same for me. I had a 6+2 TN Panel. It had 98% SRGB coverage. Now i have all these symptoms, never had that with my old setup. I am sure it used 120 hz PWM, but it didnt strain me that much. Strain adds up, so now my lighting is bothering me because of PWM, it never did before. 1000+hz flicker seems to still bother me, no light bulb i tested was ok, even philips hue triggers me.

My Eizo monitor is flickery, cant use it because it crashes my eyes. My BenQ gives me nausea and brainfog. My laptop screen is too flickery. Not sure what to do. I can use a lot of devices but the last 4 years technology changed. It is always flicker OR nausea.

Next try will be Dell. BenQ and Eizo are dead to me.