cici@cici:~$ xrandr
Screen 0: minimum 8 x 8, current 1360 x 768, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected primary 1360x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0 +
1360x768 60.0* 59.8
1152x864 60.0
800x600 72.2 60.3 56.2
680x384 60.0 59.8
640x480 59.9
512x384 60.0
400x300 72.2
320x240 60.1
DVI-I-1 disconnected (normal left inverted right x axis y axis)
1440x900_60.00 (0x2fa) 106.5MHz
h: width 1440 start 1528 end 1672 total 1904 skew 0 clock 55.9KHz
v: height 900 start 903 end 909 total 934 clock 59.9Hz
cici@cici:~$ cvt 1440 900
# 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
cici@cici:~$ xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 27
Current serial number in output stream: 27
cici@cici:~$ xrandr --addmode VGA-0 1440x900_60.00
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 27
Current serial number in output stream: 28
cici@cici:~$

https://wiki.ubuntu.com/X/Config/Resolu ... esolutions
Dynamically testing different resolutions

https://wiki.ubuntu.com/X/Config/Resolu ... esolutions
Adding undetected resolutions

https://wiki.ubuntu.com/X/Config/Resolu ... rsistently
Setting xrandr changes persistently