我有一台配备 GeForce 740M 的笔记本电脑 Acer Aspive V3-771G。我想让我的笔记本电脑在 3 个显示器上输出信息（笔记本电脑的显示器 + 我有 2 个外部显示器），但由于错误我无法做到这一点，这就是我得到的：
xrandr 输出：
Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
1920x1080 60.0 + 59.9 40.0
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1920x1080 60.0 +
1600x1200 60.0
1680x1050 60.0
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 60.0
720x400 70.1
HDMI1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1600x1200 60.0
1680x1050 59.9
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 60.0
720x400 70.1
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
lspci 输出：http://screencloud.net/v/pFFy
我正在使用 Linux Mint 17 Cinnamon（基于 Ubuntu 14.04 LTS）
谢谢！