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I have an Acer 1810T and am going to buy a Dell u2711 with a resolution of 2560 x 1440.

Can I connect the panel over HDMI with the Acer and use the 2560 x 1440 res?

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10 Answers 10

up vote 12 down vote accepted

According to this article on Wikipedia, it should be fine if your Acer supports HDMI 1.3.

HDMI version | 1.0-1.2a | 1.3 | 1.4
Maximum signal bandwidth (MHz) | 165 | 340 | 340 [50]
Maximum TMDS bandwidth (Gbit/s) | 4.95 | 10.2 | 10.2
Maximum video bandwidth (Gbit/s) | 3.96 | 8.16 | 8.16
Maximum audio bandwidth (Mbit/s) | 36.86 | 36.86 | 36.86
Maximum color depth (bit/px) | 24 | 48[A]| 48
Maximum resolution over single link at 24-bit/px[B]| 1920×1200p60 | 2560×1600p75 | 4096×2160p24
Maximum resolution over single link at 30-bit/px[C]| N/A | 2560×1600p60 | 4096×2160p24
Maximum resolution over single link at 36-bit/px[D]| N/A | 1920×1200p75 | 4096×2160p24
Maximum resolution over single link at 48-bit/px[E]| N/A | 1920×1200p60 | 1920×1200p60

HDMI 1.3 supports resolution 2560x1600 at 75Hz at 24 bits/pixel, and 60Hz at 30 bits/pixel.

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Thanks, Intel says the GMA 4500 Series supports HDMI 1.3a - so hopefully it works ;) software.intel.com/en-us/articles/… –  ben Mar 14 '10 at 12:02
18  
Sadly, it didn't work. –  ben May 25 '10 at 19:30

Dell documentation states that the U2711 HDMI port is (internally) limited to 1920x1080:

http://support.dell.com/support/edocs/MONITORS/U2711b/en/ug/operate.htm#Setting the Optimal Resolution

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3  
thanks. How annoying of Dell! –  Matthew Lock Jan 27 '11 at 6:59
1  
@g scott: Interesting. Do you have any idea why they did this? –  boehj May 15 '11 at 10:15
    
Please see my answer for a workaround. –  Tom May 21 at 1:04
    
Ignore the documentation! Dell claim their U2713HM is also limited to 1920x1080 over HDMI. But they're wrong! I've been using it at 2560 x 1440 over HDMI without difficulty. On Ubuntu and also on Windows7. I have to 'force' it (Ubuntu: using the xrandr tool as per the answer of xramonz. Windows: check how to insert a 'custom resolution' for your graphics card.) This might void your warranty, and cause everything to go up in flames. Apparently. Use at your own risk. –  Aaron McDaid Sep 19 at 14:27

I made my Dell U2711 work at 2560x1440 over HDMI, by pointing xorg.conf to a custom EDID file someone created.

...

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "DELL U2711"
    HorizSync       30.0 – 81.0
    VertRefresh     56.0 – 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400M GS"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "CustomEDID" "DFP-1: /home/dlawson/u2711/dell_u2721_custom.edid"
    Option         "metamodes" "DFP-1: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
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2  
It would be nice to include the essential parts of the answer here, and provide the link only for future reference. –  slhck Sep 4 '11 at 16:21
    
That's right. Before anyone else rushes to buy this monitor for his or her laptop, I should also point out that I've only succeeded to run full resolution at a 35Hz refresh rate. Which doesn't look terrible - the mouse cursor's motion is jumpy, and I haven't tried looking at any video. I would look for another monitor if I hadn't bought it already. –  alex k Sep 5 '11 at 14:21
    
the link to EDID file is broken, any idea where I can find this file? –  Aras Oct 26 '12 at 2:18
1  
I don't have the EDID file anymore. –  alex k Feb 4 at 10:09

I found many questions from people wanting to connect their 2560x1440 monitor on a laptop that does not support display-port or DVI.

I have a ASUS K93S and a IIYama XB2776QS and only after purchase I found in the manual that in order to use 2560 x 1440 I could only use the DVI dual link port or the displayport. Both of these connectors are not available on my laptop.

I searched the internet.

But as I didn't find a clear answer anywhere I thought I might let you know how I solved it. I am not sure if it will help you, but all I can tell you is that it worked for me.

After much digging I found that in theory a HDMI 1.3 device should be able to do this as long as a HiSpeed HDMI cable is used. Than I found that for some reason manufacturers cannot Always state the version of the HDMI they include (For my Asus I could not find it, although HDMI 1.3 is already quite old I did assume my laptop has at least HDMI 1.3).

I found that HDMI 1.3 and up need a High-Speed cable.

So I used a HiSpeed 2160P HDMI cable (actually it also supports ethernet). But just connecting to my IIYama XB2766QS gave me a max resolution of 1920 x 1080.

Than after much digging I found that it is possible to create your own resolution (at least with my NVidia VGA driver). I must warn you that you must be sure that your monitor is capable of displaying that resolution, because apparently it is possible to damage your monitor of you set the resolution etc. to high. .

So I connected my monitor, and in the NVidia driver where I could select the resolution I added the resolution 2560 x 1440 (60Hz, progressive). I pressed test (and it worked). Then I saved the resolution and choose the resolution.

Hip hip hooray, it worked.

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Welcome to SuperUser. No need for a signature here, you're SU provides one for you. –  dav May 17 '13 at 14:08
    
I did the same but the text is blurry and hard to read compared to 1920x1080. It's weird because if I use another computer with DisplayPort instead of HDMI, the graphics are displayed just fine. –  tiktak Oct 2 at 8:29

Dell U2713HM 2560x1440@41Hz via hdmi as second monitor on my laptop:

xorg.conf

...
Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"

    Option         "HorizSync" "DFP-0: 30.0-75.0; DFP-1: 31.5-88.8"
    Option         "VertRefresh" "DFP-0: 56.0-75.0; DFP-1: 29.0-76.0"

    # laptop screen
    Modeline       "1366x768_60" 70.615 1366 1414 1446 1526 768 770 775 790 +hsync +vsync
    # dell u2713hm
    Modeline       "2560x1440_41" 162.00 2560 2608 2640 2720 1440 1443 1448 1468 +hsync +vsync
    Modeline       "1920x1080_60" 148.50 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GT 240M"

    Option         "ModeValidation" "NoDFPNativeResolutionCheck"
    Option         "ExactModeTimingsDVI" "True"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option "TwinView " "on"
    Option "TwinViewOrientation" "Clone"

    Option         "TripleBuffer" "1"
    Option         "OnDemandVBlankInterrupts" "1"
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"

    Option "metamodes" "1366x768_60, 2560x1440_41"

    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

By the way, in documentation this monitor also has limitation 1920x1080@60Hz via hdmi, but with custom modeline (or custom resolution through nvidia panel in windows) works fine.

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xrandr is a very convenient program for experimenting with new modes. It should be on your machine already, I think. See the man page under 'Examples'. Beware though, it doesn't automatically revert if it failed (I think), so beware of that when executing the command - you should incorporate a 10 second delay and then another xrandr command to use a known-working resolution –  Aaron McDaid Sep 10 at 13:24

It's an older thread but I thought I would add my two cents in. Running Windows 8.1 RTM on a Retina Macbook Pro which has a NVIDIA GeForce GT 650M connected to a Dell U2711 via HDMI I managed to get it working by creating a custom resolution using the following settings (note the CVT Reduced Blank selection):

2560x1440 60Hz CVT RB Custom Resolution

The monitor info now shows resolution as "2560x1440@60Hz". The following post helped: 2560x1440 or 2560x1600 via HDMI

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I too do not have a display port on my asus zenbook, so I could not get my u2713 monitor to work at full resolution.

I attempted the HDMI custom resolution but setting it to 35 Hz was driving me nuts. So I bought a simple HDMI to DVI cable and then set the custom resolution to 2560x1440 progressive 59hz and changed the timing to CVT reduced blank.

The CVT reduced blank and 59hz is vital, otherwise the image is blurry and will periodically cut out.

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Welcome to Super User! As we are not a forum, there's no need to worry about "Reviving an old thread". The very nature of questions here is about constantly editing and adding new answers and content. –  That Brazilian Guy Nov 10 '13 at 2:20

After a good deal of experimentation I can now happily report that it is possible to run a Dell U2711 as an external monitor at 60Hz / 2560x1440 from the Intel HD 4400 integrated graphics card on a Windows 8.1 laptop.

They didn't make it easy though, and I'm not sure what the reasons for this are... so experiment at your own risk!

First of all, you will need a high quality HDMI to DVI-D (24 pin) cable, capable of carrying the required bandwidth. I found this did not work with the when connecting to the HDMI port of the monitor however connecting to the DVI input does work.

The main problem boils down to the custom resolution app simply not accepting higher refresh rates at this resolution. "The custom resolution exceeds the maximum bandwidth capacity" (If you are happy with 40Hz you do not need this hack and can simply add a custom resolution at 40Hz - the maximum it will take)

Since 60Hz used to be possible with a previous driver release (sadly not compatible with Windows 8.1) I reasoned that if I could add the 60Hz custom resolution then it would indeed work.

It turns out that custommodeapp stores newly created custom resolutions at the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000\C_MODES_DFP_79

One of the bytes in here is for the refresh rate.

First remove all custom resolutions you may have created. Then add one at 2560x1440@30Hz..

Now go and edit that reg key (run regedit)... Find byte 0x4D.. you should see this set to 0x1E : 30 Hz

Just change byte 0x4D to 0x3C (60 Hz)

Now restart your computer!

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1  
Unfortunately this hack only changes the numbers in the GUI. The actual refresh rate is still 30Hz. –  n.m. Jun 13 at 20:27

Unfortunately, it looks like there are very few devices that can do HDMI output or input above 1080p.

A HDMI-to-DVI adapter seems to work, though: http://forums.whirlpool.net.au/archive/1479962

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I had the same problem and I made it work: "XPS M1530 and 2560x1440 on U2711 with HDMI"

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3  
What does the link say? –  slhck May 15 '11 at 12:34
    
The link there is an NVidia specific hack to make the graphics card drive the HDMI output at a higher resolution than the monitor is advertising. Really useful to know it's possible. Looking at my xorg logs in Linux when connecting to a U2711, I see that the EDID information is indicating the max res as 1920x1080, so no well behaved graphics card is ever going to let you set 2560x1440 -- a per-driver hack is needed to make it work. –  kdt Aug 13 '11 at 23:31

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