我目前在 MSI Dominator 笔记本电脑上运行 Ubuntu 16.04 LTS，笔记本电脑屏幕已禁用，仅使用外接显示器（LG 34UC88 @ 3440x1440 21:9），Ubuntu 拒绝在整个显示器高度上显示。它显示在显示器的整个宽度（3440 像素）上，但仅显示在显示器的顶部 1080 像素上，导致以下情况：
我的笔记本电脑上有一块 Nvidia GTX870M 和 Intel 集成显卡，以及来自 nvidia-361 repo 的 NVIDIA 二进制驱动程序版本 361.42。
这是我的xrandr -q输出：
Screen 0: minimum 8 x 8, current 3440 x 1440, maximum 16384 x 16384
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 800mm x 335mm
3440x1440 59.97*+ 49.99 29.99
2560x1080 60.00 59.94 50.00
1920x1080 60.00 59.94 50.00
1680x1050 59.95
1600x900 60.00
1280x1024 60.02
1280x800 59.81
1280x720 60.00 59.94 50.00
1152x864 59.96
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.93
eDP-1 connected
1920x1080 60.02 + 59.93
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
VGA-1 disconnected
1680x1050 (0x47) 146.250MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz
v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz
1280x1024 (0x4b) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1024x768 (0x52) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x59) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
640x480 (0x62) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
以下是我当前的xorg.conf设置：
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "intel"
EndSection
Section "Device"
Identifier "intel"
Driver "modesetting"
BusID "PCI:0@0:2:0"
Option "AccelMethod" "None"
EndSection
Section "Screen"
Identifier "intel"
Device "intel"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "PCI:1@0:0:0"
Option "ConstrainCursor" "off"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration" "on"
Option "IgnoreDisplayDevices" "CRT"
EndSection
任何帮助都将不胜感激。我的下一步是让它在双屏设置下与内置笔记本电脑屏幕一起正确显示，如果你对此也有任何想法的话。