Ubuntu
xserver-xorg-video-intel package

  1. Bug #946311
  2. Comment #10

Comment 10 for bug 946311

Revision history for this message
Adrien Cunin (adri2000) wrote : Re: only external screen is working with asus zenbook ux31e

Same problem here: can't display both on the laptop screen and on an external monitor. Laptop screen alone is ok; when plugging the external monitor with VGA, I can only use that external monitor.
It used to work. Dell Latitude E5410, i915 driver.

There are quite a lot of this in Xorg.0.log:
[ 614.160] (WW) intel(0): flip queue failed: Device or resource busy
[ 614.160] (WW) intel(0): Page flip failed: Device or resource busy

When using xrandr:
% xrandr --output eDP1 --auto --output VGA1 --auto --same-as eDP1
xrandr: cannot find crtc for output eDP1

When using gnome-control-center display, dmesg says:
[ 107.800350] [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode on [CRTC:3]

I can test experimental packages or workarounds if needed. :-)