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I have a Dell Studio 1749 with an ATI Mobility Radeon HD 5650 Graphics card.

I've just purchased a Dell U2713HM Monitor. I need to connect them Displayport > Displayport in order to acheive the monitor's maximum resolution of 2560 x 1440 (I can't use VGA or HDMI because these cables don't have enough bandwidth to support that resolution... and the laptop doesn't have a DVI port)

When I plug the monitor Displayport cable in, it all works fine and displays at the full resolution for about 5 seconds, then the laptop freezes. Initially it just won't let me click on anything (neither using the touchpad buttons or with a mouse) and then another 5 seconds later the pointer freezes too

As soon as I unplug the Displayport cable, it unfreezes and goes back to normal

I've downloaded and installed the latest graphics card & monitor drivers.

Any advice greatly appreciated

Grant

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Have you tried leaving it for a couple minutes to see if it says frozen. Might just be slow to respond to whats happening. –  Matthew Williams Feb 21 at 15:54
    
Since you just purchased the monitor and are using a Dell laptop, contact Dell Support. –  martineau Feb 21 at 16:25
    
@Ramhound Maximum HDMI 1.3 bandwidth is 10.2Gbps, vs. DisplayPort 1.2's 17.28 Gbps. His GPU is specifically limited to 1200p on the HDMI output, and 1600p on the DisplayPort output. Even HDMI 2.0 (18Gbps) vs DisplayPort 1.3 (32.4Gbps) still pegs DisplayPort as carrying nearly double the bandwidth as HDMI of the equivalent generation. –  Darth Android Feb 21 at 17:04
    
@MatthewWilliams Have you checked the Windows Event Log (or dmesg if on linux) to see if there are any warnings or errors from the kernel or graphics driver when you connect the monitor? –  Darth Android Feb 21 at 17:07

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