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    Thinkpad X1 Carbon and X240 - DisplayPort Stuck at 640x480

    Discussion in 'Lenovo' started by ajzinthehouse, Jul 14, 2016.

  1. ajzinthehouse

    ajzinthehouse Notebook Enthusiast

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    Hello all,
    I have an X1 Carbon 2014 from work, which I had connected to a pair of Dell U2515H (daisy-chained via DisplayPort). They worked great, and gave me the pull 2560x1440 promised resolution out of each monitor.

    Recently, I upgraded to a pair of Dell U2715H, which are identical to the U2515H, just bigger. But for some reason, the resolution is stuck at 640x480 via DisplayPort. I am unable to change it, and cannot find Windows 10 drivers for the monitors.

    An HDMI does give me the full resolution.

    Any help would be appreciated.
     
  2. Thors.Hammer

    Thors.Hammer Notebook Enthusiast

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    What happens if you are only driving one of the 27" (not daisey chained) ???
     
  3. ajzinthehouse

    ajzinthehouse Notebook Enthusiast

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    Same thing. Stuck at 640x480.