I have an up-to-date 17.04 on my Lenovo thinkpad t530. I am trying to have 3 working displays using the integrated Intel graphics video controller.
The 3 displays are the integrated screen plus two external monitors, one connected on the VGA port, the other on the mini-displayport.
The following configurations are working:
- the integrated screen + one external (whichever it is)
- the two external monitors (integrated one is off)
To enable the 3 displays, I'm trying:
xrandr --output VGA-1 --mode 1920x1080 --pos 1920x0 --rotate normal --output LVDS-1 --primary --mode 1600x900 --pos 3840x180 --rotate normal --output DP-1 --mode 1920x1080 --pos 0x0 --rotate normal
which results in:
xrandr: Configure crtc 1 failed
(it may be crtc 0 or crtc 2, depending on which displays are currently on)
Before asking, I've done some searches, which led me onto this page https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1215449 It makes me belive that it is possible to have 3 working displays with this setup but I can't succed.
What can I do?
EDIT 20170911 from https://www.intel.com/content/www/us/en/support/graphics-drivers/000005556.html it is confirmed that intel HD graphics 4000 supports 3 simultaneous displays, at least with some limitations I still need to understand.