Mark12435
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U2717D, HDMI, Radeon HD4350, maximum resolution?

Hi,


I've just got my new U2717D (replacement for my U2412M) and I've attached it to my EAH4350 (Asus) video card with an HDMI cable.

Windows presents 2048x1080 as the max. available resolution.

I've uninstalled and reinstalled the U2717D driver and the video card driver (including removing the driver and previous versions of the driver from Windows). I've also tried to set a custom resolution for the video card in the registry.

Nothing works, can anyone help?


Cheers

Mark

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13 Replies
Moderator
Moderator

RE: U2717D - can't set max resolutin in Windows 7

The monitor HDMI 1.4a hardware port supports up to 2560x1440 60Hz. So the culprit is either the HDMI cable, the EAH4350, or the EAH4350 driver.

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Mark12435
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

Hello Chris,

In a system of components like this, and as everything worked with my U2412M (assuming the HDMI cable is working OK), it's equally valid to state that the problem is the U2717D. The issue is not one of deciding which component is deficient, it is of working out where the incompatibility exists and how to remove it.

It is (for example) possible that the way the monitor specifies the resolutions it supports to the computer (in the monitor driver or in other ways) is not a full description (just a single specification of 2560 x 1440 60Hz ) and so the computer falls back to a standard default.

Is there a list of video cards or chipsets tested and shown to be compatible with the U2717D?

Kind regards

Mark

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Moderator
Moderator

RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

The U2412M maximum on everyone of its ports is 1920x1200 60Hz. So that is not a good comparison to know if the old cable was ever at fault going to a better monitor with higher ended HDMI port. Start with the cable and go from there. No, there is not a list of video cards and chipset tested. By the way, the U2412M does not have an HDMI in port? So how did you use an HDMI to HDMI cable on it?

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Mark12435
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

Hello Chris,

Yes, indeed I used the DVI connection on the U2412M. I think the point is being missed. It isn't possible for Dell to state that the monitor is working perfectly and that the fault lies in another component. This is a system of components, it's a question of compatibility between components.

There are no video cards or chipsets that have been tested and work with the U2717D. There is also no way to determine what video card is compatible with the monitor. If I replace my current video card I have no way to choose a replacement that I know will work.

It seems the only options are to return the monitor and buy an alternative or keep buying video cards in the hope that one will work. It isn't much of choice.

There is no support from Dell other than, frankly, stating the obvious. It's not much in the way of customer support.

Kind regards

Mark

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Moderator
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

In all past cases, where a customer reported that a Dell monitor that is rated to do
HDMI at 2560x1440 60Hz, and the computer could not achieve that resolution, the fault was never with the monitor.

"Windows presents 2048x1080 as the max. available resolution."

The 2009 Radeon HD4350 HDMI version is 1.2. It cannot go any higher in resolution.

"HDMI means High Definition Multimedia Interface, it carries both HD video and 5.1 surround audio for a clean, high definition connection. And it can transfer both audio and video in only one HDMI cable without messy cables problem. This option means a greater choice and simplification of installation for consumers when connecting to PC monitors or home theaters for maximum enjoyment of full HD 1080p content."

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Mark12435
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

Hello Chris,

The point is that there is no fault - it's a case of incompatibility between components. Of course if a video card cannot provide the native resolution of a monitor then the options are to use a lower spec monitor or a higher spec video card. Both are valid solutions, choice of solution depends on other factors.

The max resolution of the EAH4350 card is 2560 x 1600 but this is defined for DVI only and is shown on the specifications page. There is no definition of the max resolution of the HDMI port.

www.asus.com/.../

I have never been able to find which HDMI version the card implements. Where is 1.2 specified?

www.xfxforce.com/.../xfx-amd-5450-512mb-graphics-card-hd-545x-yqh2

I've found this card that specifies HDMI 1.3 is implemented and all digital outputs support 2560 x1440.

All other things being equal, will the version of HDMI specified and the max. resolution specified on this card drive the monitor at 2560 x 1440? Put another way - will an HDMI 1.3 output at 2560 x 1440 be received and understood by the U2717D even though it implements HDMI 1.4a?

Kind regards

Mark

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Moderator
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

Not sure. Why not shop for a video card with HDMI 1.4a in the search string. Then check the specifications.

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Mark12435
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

I got the HD5450 card and it's the same. Only going at 2048 x 1080. Opened a ticket with the XFX helpdesk to see if they can help.

I searched for a card with 1.4a and found this one (you might notice that I want a fanless card).

www.sapphiretech.com/productdetial.asp

That specifies stereoscopic video over HDMI which means 1.4a and the shop also specifies HDMI 1.4a in the card specifications on their web page.

www.afuture.nl/.../sapphire-radeon-hd-6450-1gb-gddr3

That should arrive in the next few days and if that doesn't work then I'll send the U2717D back for a refund and just live with my old video card and my old U2412M which work.

Mark

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Mark12435
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RE: U2717D, HDMI, Radeon HD4350, maximum resolution?

I've done a bit more digging and found that even when the DDC/CI is disabled in the monitor settings, the EDID from the monitor can still be read. This means the option to disable DDC/CI on the monitor does nothing - DDC/CI is always on.

I've read the EDID and indeed the native DTD shows 2560x1440 but there are 2 DTDs in the extended block for 2048x1080. The video card software from AMD/ATI says the panel reports max. resolution of 2048x1080.

This makes me think that the EDID is not being read correctly by the video card - the native DTD is being ignored for some reason. Perhaps it is corrupt or incorrectly formatted in some way, or maybe the video card has a problem? Only the extended block DTDs are being used by the video card. This problem, then, cannot be fixed by turning off the DDC/CI and setting the max resolution manually - a defect in the monitor firmware means the option to disable DDC/CI doesn't work.

So a curious combination of behaviour is making this problem for me. This means that the HD6450 that I've bought may also not read the native DTD and default to the extended block DTDs. I actually expect this to happen. Will see when the new card arrives.

So the U2717D has a firmware defect (bug) that means the DDC/CI can't be disabled. Would be nice for Dell to fix that.

Mark

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