Xfce won't detect display after unplugging

Ok, I have 2 monitors at home, unfortunately 1 of the ports in my graphic card won't work.
For certain reasons, I need to use 1st display during the day, and the 2nd during the night.
But, if I just unplugg the cable from 1st display and plug it in the 2nd the screen just won't come on.
When this happens, I can access to tty2 and tty2 detects screen and displays image, restarting lightdm also displays image in display (but somehow this breaks pulseaudio leaving me with no sound :S ).
Any idea?
PS. Of course I have selected the option "Detect new screenwhen plugged" on Xfce Display Settings.
Thank you

NO
This is what want:
1. Startup computer using Monitor A
2. Unplugg HDMI cord from Monitor A and connect it in Monitor B
(After this, Monitor B goes black on tty1 (used by lightdm) and I can only have tty2, tty3 and all others available)
3. Keep picture in Monitor B when plugged, without the need of restarting lightdm or the whole computer
Until now the only workaround is this:
1. Startuo using Monitor A
2. Suspend system
3. Plugg Monitor B
4. Resume system
THanks and sorry for not being that active

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Message was edited by: Tyke Tyler
Message was edited by: Tyke Tyler

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^_^

Xfce won't detect display after unplugging

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