S h o r t S t o r i e s

// Tales from software development

Windows 7 DisplayPort Link Failure: It might be the cable

with one comment

The day after I switched from a display configuration consisting of three 24″ Dell U2412M monitors to three 30″ Dell U3014 monitors on my Dell T5600 I was disappointed to suddenly see one monitor go blank and Windows 7 display this error message:

The system has detected a link failure and cannot set the requested resolution and refresh rate on your DisplayPort display. Your display might not support the requested resolution or there may be an issue with the cable connecting the display to your computer.

I’d checked and confirmed that the T5600’s AMD FirePro V5900 graphics card could handle three monitors at 2560 x 1600 resolution and had used the new display setup for most of the previous day without any problems. So what was the problem ? A defective monitor perhaps ?

I tried a few things: unplugging and re-seating the plugs on both ends of the DisplayPort cable, powering the monitor off and on, using the Detect function from the Control Panel Display Resolution applet. All to no avail. After a bit more fiddling around unplugging and replugging the cable the monitor came back to life but Windows decided that its maximum resolution was 1920 x 1200 rather than 2560 x 1600 and wouldn’t allow the correct resolution to be set.

When I’d re-seated the DisplayPort cable plugs I noticed that the cable was different from the other DisplayPort cable (the FirePro V5900 has two DisplayPort sockets and one DVI-D socket). The cable looked a bit, well, cheap. Both DisplayPort cables were the ones that had shipped with the monitors but they were definitely different. And, the error message did specifically say, “there may be an issue with the cable connecting the display to your computer”.

I went and retrieved one of the DisplayPort cables that I’d been using previously with the U2412M monitors and which I’d had to buy because the U2412M shipped with VGA and DVI-D cables only. I’d paid a premium price for these DisplayPort cables so hopefully they were good quality cables.

After changing the cable the monitor immediately came back to life and showed up in Windows with the correct maximum resolution of 2560 x 1600.

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Written by Sea Monkey

May 3, 2015 at 8:00 pm

Posted in Hardware

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One Response

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  1. its happened to me before. shut down your pc, turn off the monitor, then unplug your monitor power supply wait 8-10 min to reset some memory function in all latest Monitor 2k and 4k.

    robert

    April 22, 2016 at 11:11 pm


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