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As far as I understand, DVI-D dual-link cables (24 pins) should be backwards compatible with single-link cables (18 pins).

However, my monitor is working fine with a short single-link cable, but giving me the following error message when I try to use a longer (5m) dual-link cable:

"The current input timing is not supported by the monitor display. Please change your input timing to 1920x1080@60Hz or any other monitor listed timing as per the monitor specifications."

Is there something that could be causing an incompatibility or is it likely to be just a dud cable?

Details: Ubuntu 10.10, Nvidia GeForce 8500 GT, Dell U2311H monitor.

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up vote 2 down vote accepted

I've tested again with a 2m dual-link cable and it works fine, so it looks like the cable is probably just too long (for the combination of graphics card and monitor).

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Update: A 3m dual-link cable is also working perfectly. – Tom Nov 17 '10 at 4:46

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