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My display is a DELL U2515H. I have a nVidia GF550Ti GPU, and both should support the native resolution of 2560 x 1440 over HDMI. But highest resolution ubuntu detected automatically is 2048 x 1152.

Tested solution "A" (unsuccessful):

  1. The command cvt 2560 1440 40 gives me

    2560x1440 39.96 Hz (CVT) hsync: 58.98 kHz; pclk: 201.00 MHz
    Modeline "2560x1440_40.00"  201.00  2560 2720 2984 3408  1440 1443 1448 1476 -hsync +vsync
    
  2. And sudo xrandr --newmode "2560x1440_40.00" 201.00 2560 2720 2984 3408 1440 1443 1448 1476 -hsync +vsync gives nothing back, so I expect it works.

  3. Finally, sudo xrandr --addmode HDMI-0 2560x1440_40.00

    X Error of failed request:  BadMatch (invalid parameter attributes)
    
    Major opcode of failed request:  140 (RANDR)
    Minor opcode of failed request:  18 (RRAddOutputMode)
    Serial number of failed request:  29
    Current serial number in output stream:  30
    
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  • Additional info: my GPU Driver = NVIDIA binary driver, ver 340.76 Aug 1, 2015 at 13:00
  • Additional info: GPU driver upgraded to version 346.59, and problem still remains Aug 1, 2015 at 13:49
  • What refresh rate and do you have a monitors.xml file? If yes, please post to paste.ubuntu.com
    – Fabby
    Aug 1, 2015 at 19:51
  • Whats the output of xrandr | grep "connected"
    – A.B.
    Aug 19, 2015 at 11:13

2 Answers 2

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Official answer on a dell forum.

Says "A maximum resolution of 2048 x 1152 through the U2515H HDMI in means that the signal it is getting from the video card is not HDMI 1.4. It is HDMI 1.3. Which is why you are getting 2048 x 1152."

You might want to check the spec on your GPU, to see what version of HDMI it supports.

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  • Welcome to Ask Ubuntu! ;-) Please don't add links to Amazon, as this might be seen as SPAM. Any external link might also become 100% useless if that link is moved, changed, merged into another one or the main site just disappears... :-( Therefore, please edit your answer, and copy the relevant steps from the link into your answer, thereby guaranteeing your answer for 100% of the lifetime of this site! ;-) You can always leave the link in at the bottom of your answer as a source for your material...
    – Fabby
    Aug 18, 2015 at 18:22
  • @MichelleHine Nice first answer! We like to avoid any external links, except as reference, so if you can try to include everything important from the link it makes it much better! Also, one small point to bear in mind that this isn't really a forum, it's a Q&A. We like to make that clear because Answers should be answers not responses - like you've done here really well. The tour should clarify a bit. Finally, the last comment has some really good info - if you edit it into your post more people will see it, and you may get more upvotes. :-)
    – Tim
    Aug 19, 2015 at 10:48
  • Thanks for your help and advice Fabby and Tim....entry edited to give one clear answer and a link for reference.
    – Chelle
    Aug 19, 2015 at 11:11
  • 1
    I've just received the same monitor, and can confirm it does work at 2560 x 1440 over HDMI on Ubuntu (14.04 with Unity), straight out the box...but my MB specifically says HDMI ver 1.4a supported.....sorry this doesn't help you though ;-)
    – Chelle
    Aug 19, 2015 at 14:09
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I had the same problem with the same monitor. In my case it was the cable, which was not able to serve a resolution higher than 2048x1152p. Make sure you use a cable that is capable to serve such a high resolution.

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