I'am at the edge of giving up on my dual monitor (daisy chaining) setup with Linux Mint. I'm not quite sure if this problem is specific to Mint.
- Dell XPS13 2015
- 2x Dell U2415
What I already did:
- Updated Kernal: 4.3.0-040300-generic
- Compiled Latest Intel Driver: xf86-video-intel
What's not happening:
- DP1 is not detected if the Display is set to DP 1.2
I wanted to test if a dual monitor setup with a laptop is becoming a possibility for work. When I first booted up with all displays connected ( XPS > Display 1 > Display 2 ) everything worked fine, but the displays were just mirrors of each other. After setting the Display 1 to "DP 1.2", I got an error on bootup. (Failed to start x-server .... jadajada). After googling and trying for hours, I had to install "xserver-xorg-dev" for the newest xorg-macros to compile the newest intel drivers with (xf86-video-intel). That removed the startup error, but the displays are still not visible in xrandr. After some more googling I upped from Kernel 4.0 to 4.3 - without luck. Disabling the DP 1.2 option shows the display in xrandr again, but still mirrored. I have confirmed with Dell support, that the XPS13 2015 should be able to do MST/DP1.2a, but I seem to fail.
Hope to get some love, G.
PS: I've found:
but the answers are either outdated or don't solve my problems!