Clarification on last comment, it did show black screen on eDP-1, which changed to having image if one logged out. After logging in, it turned into black screen with garbled 2mm band at top of the screen. Mouse was displayed on the screen if moved there, but as I said, the entire machine tended to hung completely in about 5 minutes, so I could not do that much testing.
-- 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
