Dallas1629
1 Copper

e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

I just purchased a configuration that includes a Dell Precision M4600, e-Port Plus and a U2711 monitor.  When attaching the U2711 monitor to the e-Port Plus using the DVI-D (Dual Link) cable provided by Dell, the maximum resolution I'm able to achieve is 1920x1080 (1080P).  The display driver has been updated as well as a multitude of other tests attempting to achieve 2560x1440 resolution.  What I'm I missing here.  I'd like to get the as advertised resolution to work using the DVI-D connections on the U2711 and e-Port Plus.  The displayport connection works at the maximum resolution but still leaves the issue of the DVI-D port not working correctly.  Not all monitors that could be attached to this e-Port Plus/Precision M4600 configuration will have displayport capabilities.

0 Kudos
12 Replies
Moderator
Moderator

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

I agree that the monitor DVI-D resolution is 2560x1440, but the M4600 only has VGA, HDMI, and DP. What I do not know is when connected to the e-Port Plus, which of those three laptop ports are driving the e-Port DVI ports. It would make sense that the laptop HDMI is talking to the e-Port DVI. But HDMI is a video mode and not a graphics mode. The highest HDMI can go is 1080p which is 1920x1080.

0 Kudos
skylarking
3 Silver

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

I have no experience with the e-Port docking station and in typical style, the Dell users guide says nothing about the VGD/DVI/DP port specifications, Just that you may need to repeatedly press F8 to access the required port. There may be some HDMI->DP switcheroo internal to the e-Port unit but HDMI can far exceed 1920x1080p and is not just for video.

What can be taken from the HDMI wiki is that not all devises will talk the same HDMI language so you need to be aware of the capabilities of all your interconnected devices. You need all the devices to support a minimum of HDMI 1.3 and the HDMI cable best be a dual link type B (so you don't have issues with color depth), otherwise you have little hope of seeing 2560x1440.

It gets even more confusing when you start using adapters going from HDMI version W.X to DP version Y.Z and all the variants in between emoticon.Huh?.title

For your convenience, extracts from the HDMI wiki are included below for those that are click averse :emotion-5:.

The HDMI specification defines the protocols, signals, electrical interfaces and mechanical requirements of the standard. The maximum pixel clock rate for HDMI 1.0 was 165 MHz, which was sufficient to support 1080p and WUXGA (1920×1200) at 60 Hz. HDMI 1.3 increased that to 340 MHz, which allows for higher resolution (such as WQXGA, 2560×1600) across a single digital link. An HDMI connection can either be single-link (type A/C) or dual-link (type B) and can have a video pixel rate of 25 MHz to 340 MHz (for a single-link connection) or 25 MHz to 680 MHz (for a dual-link connection)

To ensure baseline compatibility between different HDMI sources and displays (as well as backward compatibility with the electrically compatible DVI standard) all HDMI devices must support the sRGB color space at 8 bits per component. Support for the YCbCr color space and higher color depths ("deep color") is optional. HDMI permits sRGB 4:4:4 (8–16 bits per component), xvYCC 4:4:4 (8–16 bits per component), YCbCr 4:4:4 (8–16 bits per component), or YCbCr 4:2:2 (8–12 bits per component). The color spaces that can be used by HDMI are ITU-R BT.601, ITU-R BT.709-5 and IEC 61966-2-4.

There are five HDMI connector types. Type A/B are defined in the HDMI 1.0 specification, type C is defined in the HDMI 1.3 specification, and type D/E are defined in the HDMI 1.4 specification.

Type A
   Nineteen pins, with bandwidth to support all SDTV, EDTV and HDTV modes. The plug (male) connector outside dimensions are 13.9 mm × 4.45 mm and the receptacle (female) connector inside dimensions are 14 mm × 4.55 mm. Type A is electrically compatible with single-link DVI-D.

Type B
   This connector (21.2 mm × 4.45 mm) has 29 pins and can carry double the video bandwidth of type A, for use with very high-resolution future displays such as WQUXGA (3,840×2,400). Type B is electrically compatible with dual-link DVI-D, but has not yet been used in any products.

Type C
   A Mini connector defined in the HDMI 1.3 specification, it is intended for portable devices. It is smaller than the type A plug connector (10.42 mm × 2.42 mm) but has the same 19-pin configuration. The differences are that all positive signals of the differential pairs are swapped with their corresponding shield, the DDC/CEC Ground is assigned to pin 13 instead of pin 17, the CEC is assigned to pin 14 instead of pin 13, and the reserved pin is 17 instead of pin 14. The type C Mini connector can be connected to a type A connector using a type A-to-type C cable.

Type D
   A Micro connector defined in the HDMI 1.4 specification] keeps the standard 19 pins of types A and C but shrinks the connector size to something resembling a micro-USB connector. The type D connector is 2.8 mm × 6.4 mm, whereas the type C connector is 2.42 mm × 10.42 mm. For comparison, a micro-USB connector is 1.8 mm × 6.85 mm and a USB Type A connector is 4.5 mm × 11.5 mm.

Type E
   Automotive Connection System defined in HDMI 1.4 specification.

HDMI version1.0–1.2a1.31.4
Date initially released December 29, 2002 June 22, 2006 May 28, 2009
Maximum clock rate (MHz) 165 340 340
Maximum TMDS throughput per channel (Gbit/s) including 8b/10b overhead 1.65 3.40 3.40
Maximum total TMDS throughput (Gbit/s) including 8b/10b overhead 4.95 10.2 10.2
Maximum throughput (Gbit/s) with 8b/10b overhead removed 3.96 8.16 8.16
Maximum audio throughput (Mbit/s) 36.86 36.86 36.86
Maximum color depth (bit/px.) 24 48 48
Maximum resolution over single link at 24-bit/px 1920×1200p60 2560×1600p75 4096×2160p24
Maximum resolution over single link at 30-bit/px N/A 2560×1600p60 4096×2160p24
Maximum resolution over single link at 36-bit/px N/A 1920×1200p75 4096×2160p24
Maximum resolution over single link at 48-bit/px N/A 1920×1200p60 1920×1200p60
HDMI version1.01.11.2
1.2a
1.31.3a
1.3b
1.3b1
1.3c
1.4
1.4a
sRGB Yes Yes Yes Yes Yes Yes
YCbCr Yes Yes Yes Yes Yes Yes
8 channel LPCM, 192 kHz, 24 bit audio capability Yes Yes Yes Yes Yes Yes
Blu-ray Disc and HD DVD video and audio at full resolution Yes Yes Yes Yes Yes Yes
Consumer Electronic Control (CEC) Yes Yes Yes Yes Yes Yes
DVD-Audio support No Yes Yes Yes Yes Yes
Super Audio CD (DSD) support No No Yes Yes Yes Yes
Deep color No No No Yes Yes Yes
xvYCC No No No Yes Yes Yes
Auto lip-sync No No No Yes Yes Yes
Dolby TrueHD bitstream capable No No No Yes Yes Yes
DTS-HD Master Audio bitstream capable No No No Yes Yes Yes
Updated list of CEC commands No No No Yes Yes Yes
Stereoscopic 3D over HDMI No No No No No Yes
Ethernet channel No No No No No Yes
Audio return channel (ARC) No No No No No Yes
4K × 2K resolution support No No No No No Yes
0 Kudos
skylarking
3 Silver

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

In short try a DP cable and press F8 three times to get to DP out on the laptop.

0 Kudos
Harcourt
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

Seems no one answered your question correctly, not even Dell!...the reason is that the DVI-D ports on the E-port Plus do not output dual link bandwidth - you are limited to 1920x1200. We have all been 'short changed'!

rocknrule
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

Does this mean that the Display Port connection on the M4600 will not output full resolution (2560 x 1440) - what's the point of the connection?

0 Kudos
Harcourt
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

The Displayport connection will output 2560x1440 resolution (or 2560x1600 if you have a 30" monitor). However the OP was discussing the DVI-D ports. These two ports will only output a maximum of 2098 × 1311 (at reduced refresh rates) each - so will not display the native resolution of 2560x1600 of the monitor. If you need to connect to a DVI only monitor, you would need to use a Displayport to DVI-D dual link (active) adapter. But beware, there are plenty of cheap single link adapters around. Look for one that typically has a USB and Displayport cable on one end.

I don't understand Dell's thinking in placing DVI-D dual link ports on the E-port series and yet not wiring them internally for it. They had the chance to change this situation with the new docks that have USB 3.0, but they also are crippled so to speak. In my opinion, there should be clearly stated information in the specs regarding this. However if you go to Dell's US website, you will notice if you look at the E-ports that there are quite a few that have mismatching specs - i.e. the photos and or product name don't match the specs. I've mentioned this to Sales but to no avail. If a disgruntled customer complains about their purchase and asks for a refund, I would think they have legal recourse for a case.

0 Kudos
rocknrule
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

Thank you for the great reply Harcourt it is much appreciated. So I understand the displayport on the laptop itself without the E-port will work.  Funny, the Dell support people three times told me I needed to buy an E-port and use the displayports on it to get full resolution.  I guess now I'm going to get an "anything other then Dell" monitor.

You saved me from a big headache - Thanks again...;-)

0 Kudos
Harcourt
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

Your welcome rockrule. What graphic card do you have onboard?  I have a Precision M6600 with an NVIDIA  Quadro 4000m. I can get my two 30" Dell u3011 monitors to run 2560x1600 if I use the E-port plus as well. I still haven't received an answer on this forum whether or not I can get a third 30" monitor to reproduce this resolution. I know I can get 1920x1200, but that's not what I want.

0 Kudos
rocknrule
1 Nickel

Re: e-port plus + M4600 + U2711 DVI-D Max Resolution Problems

I have a m4600 with a 2000M but I just sold a my M6600 with a 4000M card because it wouldn't fit in my laptop case, stupid I know but I travel a lot overseas so I got a really nice TUMI case for my previous Dell, a M6500 and it was perfect until the 6600 arrived and it was that much bigger so I finally got a 4600 and I'm not happy so I'm getting a M6700 with the K5000M card and I'm thinking of either an Apple 27" or a Samsung 27" when I'm in my office.  Any thoughts on that, I'm an entrepreneur/engineer/inventor so I do everything from design to big spreadsheets. Here's my product eTape16.com.  Was just on TV.

0 Kudos