Ubuntu uses the cvt command to generate the screen resolution and refresh rate under xorg. conf.

Ubuntu uses the cvt command to generate the screen resolution and refresh rate of xorg. conf to generate 1024x768. Refresh 75Hzluther @ gliethttp :~ $ Cvt102476875 #1024x76874.90Hz (CVT0.79M3) hsync: 60.29 kHz; pclk: 82.00 MHzModeline "1024x768_75.00" 82.00 & n

Ubuntu uses the cvt command to generate the screen resolution and refresh rate under xorg. conf.

Generate 1024x768 refresh 75Hz
Luther @ gliethttp :~ $ Cvt 1024 768 75
#1024x768 74.90Hz (CVT 0.79M3) hsync: 60.29 kHz; pclk: 82.00 MHz
Modeline "1024x768_75.00" 82.00 1024 1088 1192 1360 768 771-hsync + vsync
Generate 1280x600 refresh 75Hz
Luther @ gliethttp :~ $ Cvt 1280 600 75
#1280x600 74.76Hz (CVT) hsync: 47.03 kHz; pclk: 78.25 MHz
Modeline "1280x600_75.00" 78.25 1280 1344 1472 1664 600 603 613-hsync + vsync

Set screen resolution

Luther @ gliethttp :~ $ Sudo cp/etc/X11/xorg. conf/etc/X11/xorg. conf. raw
Luther @ gliethttp :~ $ Sudo vim/etc/X11/xorg. conf
Section "Monitor"
Identifier "Configured Monitor"
Modeline "1024x768_75.00" 82.00 1024 1088 1192 1360 768 771-hsync + vsync
Modeline "1280x600_75.00" 78.25 1280 1344 1472 1664 600 603 613-hsync + vsync
Option "PreferredMode" "1024x768_75.00"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection

Section "Device"
Identifier "Configured Video Device"
EndSection