I am running RHEL 6 with gnome desktop.
I have 3 monitors attached; because of distance from processor to monitors I have to use video converters. Unfortunately the processor sees the converters rather than the monitors and assumes the resolution is 1920 x 1080, whereas it is actually 1280 x 1040.
I can alter this at each login using xrandr from a script, but it would make more sense to run xrandr from some initialisation script.
I have had a look round the web, but none of the solutions seems to work. Can anyone suggest a way of doing this? Thanks.

Xrandr is fine when you want to change settings on the fly, but for static settings you better create a proper xorg.conf file. You can find documentation on that in chapter 3.3 of Red Hat's customer documentation.

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