Dual head switching problem

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http://askubuntu.com – My media player runs Ubuntu 12.10 with video drivers Gallium 0.4 on AMD RV710, experience standard. The graphics card is reported (lshw) as a Radeon HD 4350. This card is driving two displays. The first is a 17" Dell 4:3 monitor via DVI at around 800:600 pixels. This houses the Launcher and a few screenlets and always remains on. It is the only screen I have on at boot. The second display is an LCD 16:9 TV of 42" via HDMI at 1920:1080 pixels. This is switched on occasionally when required. The display is then extended so that the Dell is on the left and the TV the right, with the tops (HowTos)