I have 2 video cards. 1X HD7850 (main video card) 1X HD6450
I have installed the driver for ATI AMD Beta 12.11 from AMD website It works very good..
And than, I go in AMD Catalyst Control to manage my displays. I place them all side by side (4 monitors) They have been detected with the good resolution for each of monitors I have.
Than I reboot without activating Xinerama yet... I see now my 1st video card (HD7850) show the unity bar with wallpaper that's find.
But the other video card(HD6450) show me a white (grey) display on both monitors of the card... If I drag my mouse to one of these monitors, I see a X pointer for my mouse and cant move to a another display anymore.
I reboot... I activate Xinerama, and now I can see all wallpapers on all screens and my mouse can travel where I want. No more white display. Very nice, all monitors working with the good resolution.
But this is when Unity wont start anymore :/
unity --replace and I get
Warning: no DISPLAY variable set, setting it to :0
(I still can see icons on desktop, move the mouse, right clic and see options from desktop... but no panel bar (unity))
Anyone can help please?
Thank you very much.