Cannot activate third display
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xserver-xorg-video-intel (Ubuntu) |
New
|
Undecided
|
Unassigned |
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.
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.