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How can I get WQHD 2560 x 1440 resolution with dual link DVI cable. It does not seem to work. I can only get 1900x1200. The monitor is Dell 27" U2713HM. (The other in the dual-display is LG with max 1900x1200 resolution.) -Ubuntu 12.10

 The Software Sources, Additional Drivers sayz...
 Using X.Org X server - AMD/ATI display driver wrapper from xserver-xorg-video-ati (open source, tested)
 Monitor is capable of displaying WQHD resolution (and has dual link cable.)

 sami@sami:~$ lspci
 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
 00:1c.6 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
 00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 8 (rev b5)
 00:1f.0 ISA bridge: Intel Corporation P67 Express Chipset Family LPC Controller (rev 05)
 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cayman PRO [Radeon HD 6950]
 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cayman/Antilles HDMI Audio [Radeon HD 6900 Series]
 07:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
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