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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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5 Answers

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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
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Sadly, it didn't work. – ben May 25 '10 at 19:30
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up vote 8 down vote

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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thanks. How annoying of Dell! – Matthew Lock Jan 27 '11 at 6:59
@g scott: Interesting. Do you have any idea why they did this? – boehj May 15 '11 at 10:15
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up vote 1 down vote

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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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
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up vote 0 down vote

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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up vote 0 down vote

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

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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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