Dual Monitors on Debian Linux with Nvidia N200

Lars turned me on to the benefits of a dual-monitor desktop (and the Kinesis keyboard) in the Collaboraid office, and when I set up my home office I wanted the same. Having wasted more than a few Danish weekends struggling with X driver problems, I determined to do a lot more research. After wasting less than a day or two net, I’ve been working on my dual-monitor setup for almost a month without any problems, so I am documenting it on the internet for anybody else who was equally frustrated at how hard it was to find out what to buy.

The key features of my setup are:

• Two flat-panel monitors, each with 1600x1200 resolution
• digital connections from the video card to the monitors
• Both monitors driven from the same video card
• the correct video driver for Linux kernel 2.6
• Excellent performance

• Dell UltraSharp 2001FP 20" monitor, US$800 each
• PNY Nvidia Quadro NVS 280 AGP video card, US$100
• LFH-60 to dual DVI splitter cable, US$30. The video card comes with a big 60-pin connector and a splitter to two VGA connectors, but the digital picture is noticably sharper.

• Debian Linux, sid distribution
• NVidia's binary driver, as per the Debian-nVidia HOWTO. There are two main ways to do multiple monitors in Xwindows; one is to use two or more video cards and have X span them, and the other is to let the video card manage the monitors and present X with a single workspace. In my experience, the second approach works much better.
• The relevant parts of my XF86Config-4 file are:

  Section "Device"
  	Identifier	"PNY NVS 280"
          BusID           "PCI:1:0:0"
  	Driver		"nvidia"
  Option 		"TwinView"
  Option		"SecondMonitorHorizSync" "28-80"
  Option		"SecondMonitorVertRefresh" "43-76"
  Option		"MetaModes" "1600x1200, 1600x1200"
  Option		"TwinViewOrientation" "LeftOf"
  
  EndSection
  Section “Screen”
  Identifier	“Default Screen”
  Device          “PNY NVS 280”
  Monitor	        “Generic Monitor”
  DefaultDepth    24
  SubSection “Display”
  Depth		24
  Modes		“1600x1200” “1280x1024” “1024x768” “800x600” “640x480”
  EndSubSection
  EndSection

• For high-resolution screen backgrounds at 3200x1200, PlasmaDesign.co.uk., £7
• The KDE Desktop includes Multiple Monitor support, which ensures that dialog boxes pop up in the middle of a monitor instead of splitting themselves in the middle and lets me maximize windows to just one monitor.