So I was asking about the a770 mainly and UHD 770 which they said will not dither if using true 8 or true 10bit display!! This is really good news. The only thing in question is windows bringing it's own dithering ? But supposedly on arc you can disable windows active color management which would disable os dither right ?

Its been a while, but in my testing with a capture card + analysis I've not found windows to ever introduce dithering, only GPUs.

Seagull What's weird is a member here tried 1809 vs 2004 and 2004 had pixel flickering while 1809 did not hmm

Seagull windows will definitely introduce its own dithering on Windows 11 2022 Update and later if acm is enabled Windows 10 is less well researched though, not sure about anything related to 10

Anyone tried this to enable/disable windows 11 acm? https://pureinfotech.com/enable-new-auto-color-management-acm-windows-11/ https://github.com/thebookisclosed/ViVe Once you have the tool downloaded follow the instructions in the first link and run the below in command prompt (admin mode) and restart pc: vivetool /disable /id:36371531 Query to see if ACM is disabled: vivetool /query /id:36371531

photon78s Even with that tool, I still can't get the acm feature to appear in advanced display settings. Maybe because I'm not on the insider build or previewing latest windows features. Reddit users report similar: https://www.reddit.com/r/Monitors/comments/12sb7vr/windows_11_auto_color_management_acm/?sort=new https://www.reddit.com/r/Monitors/comments/15e75xa/windows_11_acm_is_just_another_piece_of_trash_on/

I also tried to enable acm with my RTX 3060 but without success. Tried to enable it with the command and tried with regedit, both failed. I’m on the latest Windows 11 build. Please let me know if I’m missing something

photon78s Same here. I think we both also don't have the Overdrive function in the Vantage software. Do you have CPU overclock in the bios? I'm missing features and I updated the bios to the latest version. So weird.

Dadab12 I have overdrive in vantage and I leave it off. Running bios version: KWCN42WW

twomee I am running windows 11 23H2. It seems it is out of end-user control. At least when I run the query command it says that the "state" is disable for ACM. Have you noticed anything different in the gradient banding test chart? After playing with this tool to enable then disable acm, I no longer notice some slight color shifts in blooey's banding test chart. I notice this when I toggle ditherig settings from disable dithering to enabling spatial dithering. So it seems that I've enabled acm even when it is reported as disabled through vivetool. 🙁

photon78s I see. My bios is KWCN18WW I'm missing so many features and I have no clue what to do. Sigh. I also played with the Vivetool to check for ACM, and I have no idea how I can access "blooey's banding test chart". I tried looking it up but couldn't find anything.

Intel confirmed no dithering on Intel arc a770

whystrainwhy

Aquila Windows 10 Pro 22H2

autobot

whystrainwhy That's great news. Can you share the message from them ?

Also is it also true for that the whole ARC line from intel doesn't do dithering ?

WhisperingWind

I am also interested in trying out the Intel Arc. However, I find the term 'by default' a bit confusing. In my experience, we often have more issues with drivers than with the hardware itself. Even if dithering is enabled/disabled on hardware by default, it might be possible to change this setting through the driver. This raises a question about Intel's response: are they considering the role of the driver in their answer, or are they only referring to the default settings of uninitialized hardware?

autobot

WhisperingWind from[1]: "For a normal case of SDR desktop (8bpc), dithering is enabled only when we know that the panel is of <8bpc. (i.e. 6bpc)"

[1]end of page: https://community.intel.com/t5/Graphics/how-to-disable-dithering-6bit-display/m-p/1572797

WhisperingWind

autobot

This is indeed the case for my pc: i5-12450H , Intel UHD Graphics Xe (driver v. 31.0.101.5537), Windows 11 23H2, 8-bit monitor.

Ditherig.exe does nothing for my graphics card. The writing to the register is not performed because there is no dithering. It seems that dithering is disabled by default, and the driver doesn't enable it in my case.

Out of curiosity, I added logging to ditherig app (https://ledstrain.org/d/1001-ditherig-is-open-source-on-github).

Here is an explanation of how to read the log:

RegisterValue - the value read from the register.

RegisterDataFromDB - bits that need to be set to 0 in the register to disable dithering. The writing is done using a mask to avoid overwriting bits that are not related to dithering.

NewRegisterValue - the new calculated value to be written to the register in order to disable dithering; If it is equal to the value that was read from the register, then no writing occurs.

The contents of the log file:

Address=603c000000 RegisterAddress=70030 Address+RegisterAddress=603c070030 RegisterValue=4000000 RegisterDataFromDB=0 RegisterMaskFromDB=1c NewRegisterValue=4000000

There is no need to update the register with the value 'NewRegisterValue' because it is already equal to 'RegisterValue'

Address=603c000000 RegisterAddress=71030 Address+RegisterAddress=603c071030 RegisterValue=0 RegisterDataFromDB=0 RegisterMaskFromDB=1c NewRegisterValue=0

There is no need to update the register with the value 'NewRegisterValue' because it is already equal to 'RegisterValue'

Address=603c000000 RegisterAddress=72030 Address+RegisterAddress=603c072030 RegisterValue=0 RegisterDataFromDB=0 RegisterMaskFromDB=1c NewRegisterValue=0

There is no need to update the register with the value 'NewRegisterValue' because it is already equal to 'RegisterValue'

Address=603c000000 RegisterAddress=73030 Address+RegisterAddress=603c073030 RegisterValue=0 RegisterDataFromDB=0 RegisterMaskFromDB=1c NewRegisterValue=0

There is no need to update the register with the value 'NewRegisterValue' because it is already equal to 'RegisterValue'

WhisperingWind

When I enabled Auto Color Management (by default, ACM was disabled), I got the following entry in the log:

Address = 603c000000 RegisterAddress = 70030 Address + RegisterAddress = 603c070030 RegisterValue = 4000110 RegisterDataFromDB = 0 RegisterMaskFromDB = 1c NewRegisterValue = 4000100
We should update the register with the value 'NewRegisterValue' because it is not equal to 'RegisterValue'. The updating was successful.

The register value 0x4000110 in binary representation is 0100000000000000000100010000. The fifth bit is set to 1. According to the ditherig database, this is Spatial dithering. Its value in the database is 0x00000010 (00000000000000000000000000010000), i.e., the very same fifth bit.

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