After much experimenting, the problem seems to be with the nvidia driver. Updating it to nvidia-361 made *this* problem go away, except it renamed all outputs, refused to show anything on eDP-1 and made the whole thing hung in 5 minutes after reboot. Reverted to 15.10 which has less difficulties.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1561452 Title: Cannot activate third display Status in xserver-xorg-video-intel package in Ubuntu: New Bug description: When trying to extend desktop to third display, following error is given. It can be configured as mirror of DP-1-2 but not as extended display. # xrandr --verbose --output eDP1 --primary --output DP-1-2 --right-of eDP1 --output DP-1-4 --right-of DP-1-2 --mode 1920x1080 screen 0: 5760x1080 1525x286 mm 95.92dpi crtc 0: 1920x1080 60.05 +0+0 "eDP1" crtc 4: 1920x1080 60.00 +1920+0 "DP-1-2" crtc 5: 1920x1080 60.00 +3840+0 "DP-1-4" xrandr: Configure crtc 5 failed crtc 0: disable crtc 1: disable crtc 2: disable crtc 3: disable crtc 4: disable crtc 5: disable crtc 6: disable crtc 7: disable screen 0: revert crtc 0: revert crtc 1: revert crtc 2: revert crtc 3: revert crtc 4: revert crtc 5: revert crtc 6: revert crtc 7: revert Steps to reproduce: 1. Take one Dell Precision M4800 laptop 2. Attach two external displays with DP 3. Install ubuntu 16.04 4. displays are not extended to third display Expected behaviour: In 14.04 and 15.10 display was automatically activated and extended. This is what I hoped. Actual behaviour: Display stays blank and cannot be activated even with xrandr. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1561452/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
