Limited Range RGB over HDMI

DNara1 — Mon, 05 May 2014 04:15:11 GMT

Dear Intel staff,

This issue has been raised countless times on this forum (and others) for the past few years, but with no result

So, I am going to raise it yet again, as a sort of reminder to the techies at Intel (and Nvidia) to fix their display drivers

Problem : Limited range RGB over HDMI, when connected to PC monitors

(Only occurs with monitors connected to Intel HD Graphics/Nvidia graphic cards)

Reason: Monitors are being recognized as 'digital televisions' and not monitors, hence are fed limited range RGB (16-235), intended for HDTVs

as opposed to full range RGB (0-255)

Results: Colors are washed out, banding is ever so obvious (especially on better displays)

Not cool for people who rely on color accuracy for a living

Analysis: Some, more ambitious individuals have been so frustrated by the lack of acknowledgement/response/action to this problem, they have gone to

the extent of editing EDID information of their monitors, in order for display drivers to forcefully feed the full range RGB to their monitors

This has worked, but it is an unnecessary hassle for the end user

Solution: 1) Edit display driver information to recognize PC monitors over HDMI as monitors, and not 'digital televisions'

That way, full range RGB can be delivered when it detects a monitor

2) Alternatively, have an on/off feature for this functionality under the display adapter properties (similar to what you've done for the video overlay feature)

Please note, an earlier response by your staff that this problem has been fixed is INACCURATE. This is in relation to enabling full range RGB

for video overlay (refer https://communities.intel.com/message/226974# 226974 https://communities.intel.com/message/226974# 226974)

As stated, it is an overlay for video only. Colors are still washed out, pretty much the rest of the time (ie, when not watching a video)

Why does this need to be solved?

- An increasing number of monitors nowadays only come with HDMI/Display port. If the latter is not an option, you're stuck with HDMI!

I am confident that your staff have the technical know how to solve this problem. It has been way too long, so please don't turn a blind eye or a deaf ear

This is an entirely Intel/Nvidia problem

AMD APUs/Graphic cards do not have this problem

I have always been an Intel/Nvidia person, and looking to stay that way

Hoping for some good news from you guys! It will definitely bring plenty of smiles to existing frustrated users

Thank you and have a pleasant day!

Re: Limited Range RGB over HDMI

Silvia_L_Intel1 — Mon, 05 May 2014 13:33:31 GMT

Inspiron, this has been escalated already to our engineering team and we are still waiting for a resolution.

I really apologize for the inconvenience.

Re: Limited Range RGB over HDMI

pgarc11 — Wed, 21 May 2014 09:54:54 GMT

In my case my TV works with limited RGB. after each reboot of my computer it returns to Full RGB.

is it so hard to keep options of users saved in the configuration panel ?

Re: Limited Range RGB over HDMI

DHeim — Fri, 10 Jul 2015 12:23:24 GMT

Has there been any progress on this? I just bought a new laptop with Intel HD 5500 graphics and only an HDMI port for an external monitor. The Intel provided drivers do not seem to support custom resolution anymore. Is editing the EDID the only option left?

Re: Limited Range RGB over HDMI

Bryce__Intel — Thu, 23 Jul 2015 23:30:30 GMT

Hi,

I spoke with the Devs and they indicated the below. Please check your system

15.33 branch - RGB override would work if the panel EDID supports the override option, many do not. This is a limitation of the driver which was resolved in later branches.

15.36+ driver branches - RGB override is working regardless of panel support.

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