Ubuntu 16 Setting Screen Samsung SyncMaster T240M

$cvt 1600 1000 #get right values for this resolution
$gtf 1600 1000 60 #alternative


# 1600x1000 59.87 Hz (CVT 1.60MA) hsync: 62.15 kHz; pclk: 132.25 MHz
Modeline "1600x1000_60.00" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync
 
$ sudo xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync  #define

$ sudo xrandr --addmode DVI-I-1 "1600x1000" #register on system

$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DVI-I-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95 +
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 60.00
1152x864 75.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1600x900 59.95*
1600x1000 59.87
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
1600x900_60.00 (0x58e) 118.250MHz -HSync +VSync
h: width 1600 start 1696 end 1856 total 2112 skew 0 clock 55.99KHz
v: height 900 start 903 end 908 total 934 clock 59.95Hz

* Set permanent settings using ~/.xprofile (for example)
$vi ~/.xprofile
#
xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync 
xrandr --addmode DVI-I-1 "1600x1000"


* Problem: After nvidia drivers installation this doesn't works (crap)



$xrandr --fb 1600x1000 #show
xrandr: specified screen 1900x1000 not large enough for output DVI-I-3 (1920x1200+0+0)
xrandr: Configure crtc 0 failed
X Error of failed request:  BadValue (integer parameter out of range for operation)
#or
X Error of failed request:  BadMatch (invalid parameter attributes)

$xrandr --output DVI-I-3 --scale 1x0.85  #this solve  after nvidia drivers installation



References:
http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/