Public bug reported:
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.
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Output of ubuntu-bug"
https://bugs.launchpad.net/bugs/1561452/+attachment/4609607/+files/ubuntu-bug.txt
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https://bugs.launchpad.net/bugs/1561452
Title:
Cannot activate third display
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