Displayport 1.2 to 1.1 no extended desktop

[Bob.]

MSI R9 390 (latest crimson drivers), Dell U2415 (DP 1.2 enabled), Dell U2412M (DP 1.1)
Using the mini DP cable that came with the 2415. Using a standard DP cable between the two.

I can't seem to get anything other than a duplicated desktop, which is of no use to me. I need the extended desktop. What am I misiing?

Thanks,
Bob

 

[Elixer]

Is that what you have enabled in the radeon settings?
I think duplicate is the default mode.

 

[Bob.]

I don't see any extended/duplicate setting in the Radeon settings. Where would that be? I choose 'Extended' via the WinKey/P shortcut, which has always 'stuck' when using DP>DVI.

 

[Bob.]

Also, with a 3rd display attached via DVI (Dell U2410), the DVI is extended from the main display (2415). Radeon only shows 2 monitors (The 2 DP monitors). Clicking Identify shows each monitor numbered 1,2,3.

 

[Elixer]

Erm.. sorry, try going to Control Panel\Appearance and Personalization\Display\Screen Resolution and see what it shows you there.

 

[Bob.]

Erm.. sorry, try going to Control Panel\Appearance and Personalization\Display\Screen Resolution and see what it shows you there.

Bingo! For some reason, it wasn't taking the 'Extend' setting there. I set it to Extend and problem solved. Amazing what the right information can do. Thanks very much.