HDMI with resolution 2560 x 1440 possible?

Question

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?

Answer 1

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.

Answer 2

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

Answer 3

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

Answer 4

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):

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

Answer 5

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.

Answer 6

2560x1440 @60Hz working fine: Here's some xrandr numbers (30, 41, 55, 58 and 60Hz, all good), they work on my DELL 2711b monitor and "[AMD/ATI] Pitcairn XT [Radeon HD 7870 GHz Edition]" graphics card, and a fat HDMI cable:

xrandr --newmode "2560x1440_30" 146.25 2560 2680 2944 3328 1440 1443 1448 1468 -hsync +vsync   # 29.94
xrandr --newmode "2560x1440_41" 162.00 2560 2608 2640 2720 1440 1443 1448 1468 +hsync +vsync   # 40.57
xrandr --newmode "2560x1440_55" 220.812 2560 2608 2640 2720 1440 1443 1448 1478 -hsync -vsync  # 54.93
xrandr --newmode "2560x1440_58" 231 2560 2608 2640 2720 1440 1443 1448 1468 -hsync -vsync      # 57.85
xrandr --newmode "2560x1440_60" 239.56 2560 2608 2640 2720 1440 1443 1448 1468 -hsync -vsync   # 60.00

xrandr --addmode HDMI-0 2560x1440_30  # 29.94
xrandr --addmode HDMI-0 2560x1440_41  # 40.57
xrandr --addmode HDMI-0 2560x1440_55  # 54.93
xrandr --addmode HDMI-0 2560x1440_58  # 57.85
xrandr --addmode HDMI-0 2560x1440_60  # 60.00

xrandr --output HDMI-0 --mode 2560x1440_60

xrandr  # To see the results.

They're collected from @xramonz and Phil highland74's answers, and http://www.notebookcheck.net/2560x1440-or-2560x1600-via-HDMI.92840.0.html - and then playing hard with the dot clock on the first argument.

It hasn't exploded yet (5 minutes and counting..)

Update 2019-06-22: I now also run 2x these from a MacBook Pro, over HDMI using two different USB-C to HDMI dongles (the DELL 2711's DP ports are already used for my stationary Linux box). Using a Mac shareware program called SwitchResX, I could hack the dot clock there too, and again got it to work 2560x1440 @60Hz: https://apple.stackexchange.com/questions/63259/macbook-pro-w-retina-display-connected-to-dell-u3011-monitor-via-hdmi-periodi#comment479831_63262

Answer 7

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.

Answer 8

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!

Answer 9

I work with Linux Mint 18 with a Dell U2711 (2560x1440).

To get the max resolution of 2560x1440, type this in the terminal:

xrandr --newmode "2560x1440_60.00" 146.25 2560 2680 2944 3328 1440 1443 1448 1468 -hsync +vsync
xrandr --addmode Virtual1 2560x1440_60.00

Answer 10

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.

Answer 11

Well, it's about a different laptop, but for me, none of the xrandr modelines on this page worked. It turns out to be because Intel HD 4000 is limited to 225 MHz clockrate on HDMI, and the display I'm using wants 50-70 Hz vertical refresh.

So I suggest the general approach would be to:

1. Find out the specific graphics controller on the laptop and try to find out the maximum HDMI clock rate. You can also do it by trying out what rates xrandr or the Windows drivers will accept.

2. Find out what vertical refresh rate the display supports. This is usually specified in the manual.

Then it boils down to finding a video mode that fills both these constraints. There are several calculators for this, I used cvt_modeline_calculator_12 and ended up with:

./cvt12 2560 1440 55 -b # To generate the modeline below
xrandr --newmode "2560x1440_55.00_rb"  221.11  2560 2608 2640 2720  1440 1463 1468 1478 +hsync -vsync
xrandr --addmode HDMI1 2560x1440_55.00_rb

Which worked fine for me.

Answer 12

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

Answer 13

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