ubuntu headless server resolution 解像度 モニター無し

http://askubuntu.com/questions/453109/ubuntu-14-04-add-fake-display-when-no-monitor-is-plugged-in
http://blog.mediafederation.com/andy-hawkins/ubuntu-headless-vnc-vesa-800x600-fix/

sudo apt-get install xserver-xorg-video-dummy

sudo nano /etc/X11/xorg.conf

Section "Device"
Identifier "Configured Video Device"
Driver "dummy"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
HorizSync 31.5-48.5
VertRefresh 50-70
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x800"
EndSubSection
EndSection