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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.
     
    ajzinthehouse, Jul 14, 2016
    #1
  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) ???
     
    Thors.Hammer, Jul 14, 2016
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  3. ajzinthehouse

    ajzinthehouse Notebook Enthusiast

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    Same thing. Stuck at 640x480.
     
    ajzinthehouse, Jul 15, 2016
    #3