How are the screens placed in nvidia-settings? If you drag them atop each other, you get overlay. Placing them next to each other (up/down/left/right -whatever) should arrange the display real estate that way.
nvidia-settings can’t see the screens connected to the sink device because it doesn’t (yet) use RandR 1.2 to find additional displays. You’ll need to use an RandR client such as the xrandr command-line tool to change the configuration.
Hello, I have similar problem on my DELL laptop with nVidia Optimus - I have connected two external displays (via DVI on port replicator), but nVidia driver see only one display, and both displays are showing the same picture.
I am already asked about help on DELL forum, but without success (for more details see here).
My configuration:
DELL Latitude E5440
Kubuntu 14.04 64bit (KDE v4.13.3)
X server: 11.0 (vendor version: 1.15.1, NV-CONTROL v1.29)
Hello and thank you for response. Unfortunately my problem is little bit different from these mentioned on your links (and beyond I want to avoid Bumblebee if I am using nVidia driver with Optimus support).
The main issue is that Xrandr on my computer doesn’t see two external displays, but only one as DisplayPort-1-0.
It seems to me, that port replicator where my displays are connected via DVI ports is connected to the laptop via one DisplayPort, so probably there is some problem with displays identification.
Because this is working well on Windows 7 I suppose that this can be some missing feature in nVidia driver, but I can get confirmation about this.
Interesting research! Glad to see there’s something in the works. You could always install 3.16 kernel on your system, but of course there’s the risk of stability loss… albeit, I’ve never experienced it myself since the Linux Kernel is pretty solid. :)
I am upgraded to Ubuntu 14.04.3 and Kernel 3.19.0-25 today (sudo apt-get install linux-generic-lts-vivid), and DP MST starts working like a charm. Problem solved.