我最近在装有Nvidia Quadro K1100M显卡的Dell M3800上安装了Ubuntu 14.04的新副本。
后来我还通过HDMI(HDMI到DVI接口)连接了外部显示器。然后，我开始在笔记本电脑的屏幕上看到缓慢的屏幕性能。呆滞是指我的击键或动作似乎总是滞后。有趣的是，这似乎只发生在我的笔记本电脑屏幕上，外接显示器工作正常。
我已确保安装并使用Nvidia的专有驱动程序331.38。
因此，我检查了系统设置>显示。并正确显示2个屏幕，如下所示。
但是后来我去了Nvidia X Server设置，它只显示一个屏幕，具有一个大屏幕分辨率，如下所示。
我认为这导致笔记本电脑的性能下降，因为我假设外接显示器和笔记本电脑的屏幕均具有不同的屏幕刷新率。
我在下面转储xorg.conf并xandr输出
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 331.38 (buildmeister@swio-display-x64-rhel04-15) Wed Jan 8 19:53:14 PST
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia" 0 0
Inactive "intel"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "keyboard"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection
Section "Device"
Identifier "intel"
Driver "modesetting"
BusID "PCI:0@0:2:0"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "PCI:2@0:0:0"
EndSection
Section "Screen"
Identifier "intel"
Device "intel"
Monitor "Monitor0"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Monitor "Monitor0"
Option "AllowEmptyInitialConfiguration" "on"
Option "ConstrainCursor" "off"
SubSection "Display"
Modes "nvidia-auto-select"
EndSubSection
EndSection
xrandr 输出，
cdtank@cdtank-Dell-Precision-M3800:~/work$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
eDP-1-0 connected 1920x1080+0+0 344mm x 193mm
1920x1080 60.0*+ 59.9
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 60.0
960x720 60.0
928x696 60.1
896x672 60.0
960x600 60.0
960x540 60.0
800x600 60.0 60.3 56.2
840x525 60.0 59.9
800x512 60.2
700x525 60.0
640x512 60.0
720x450 59.9
640x480 60.0 59.9
680x384 59.8 60.0
576x432 60.1
512x384 60.0
400x300 60.3 56.3
320x240 60.1
VGA-1-0 disconnected
HDMI-1-0 connected 1920x1080+1920+0 598mm x 336mm
1920x1080 60.0*+
1600x1200 60.0
1680x1050 59.9
1400x1050 59.9
1600x900 60.0
1280x1024 75.0 60.0
1440x900 59.9
1280x960 60.0
1280x800 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 60.0
720x400 70.1
DisplayPort-1-0 disconnected
HDMI-1-1 disconnected
更新
删除xorg.conf后重新启动。这是它的内容。
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "intel"
EndSection
Section "Device"
Identifier "intel"
Driver "modesetting"
BusID "PCI:0@0:2:0"
EndSection
Section "Screen"
Identifier "intel"
Device "intel"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "PCI:2@0:0:0"
Option "ConstrainCursor" "off"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration" "on"
EndSection
笔记本显示器仅计算机 Nvidia X服务器设置仅显示1个屏幕（笔记本电脑+已连接外部显示器）...
