Sometimes our ubuntu drivers don't work so well as we espect with our screens, most of the time we get a low resolution in our screens and cannot change it via GUI, fortunately using xrandr we can easily configure our screens to force them to a better resolution.
First of all, get the screens active in your pc:
$ xrandr Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 32767 x 32767 LVDS1 connected 1600x900+1920+0 (normal left inverted right x axis y axis) 310mm x 174mm 1600x900 60.0*+ 1440x900 59.9 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 HDMI1 disconnected (normal left inverted right x axis y axis) VGA-0 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 518mm x 324mm 1280x1024 75.0 60.0 1152x864 75.0 1280x720 60.0 50.0 59.9 1024x768 75.1 60.0 800x600 75.0 60.3 720x576 50.0 720x480 60.0 59.9 640x480 75.0 60.0 59.9 720x400 70.1 HDMI2 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Let's create a new resolution using cvt
$ cvt 1368 768 60 1368x768 60.89 Hz (CVT 1.44M9) hsync: 70.55 kHz; pclk: 151.25 MHz Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
Now we Add a new mode to the existing list (newmode is the name and remaining portion is )
$ sudo xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
What we do now it's to find the current display/s
$ xrandr | grep -e " connected [^(]" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/" VGA-0
Add new display mode where is the output from the previous command
$ sudo xrandr --addmode VGA-0 1368x768_60.00
This will add the new resolution to your existing list of supported resolutions. You can then choose the right option from the "display settings" or following command
$ xrandr --output VGA-0 --mode "1368x768_60.00"
To make this change permanent,
$ cat> ~/.xprofile sudo xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync sudo xrandr --addmode VGA-0 1368x768_60.00 xrandr --output VGA-0 --mode "1368x768_60.00"
edit the file /usr/sbin/lightdm-sessionand add the xrandr configuration after the # Load profile section
Here is how the part of that file looks now:
#!/bin/sh
#
# LightDM wrapper to run around X sessions.
echo "Running X session wrapper"
# Load profile
for file in "/etc/profile" "$HOME/.profile" "/etc/xprofile" "$HOME/.xprofile"; do
if [ -f "$file" ]; then
echo "Loading profile from $file";
. "$file"
fi
done
xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
xrandr --addmode VGA-0 1368x768_60.00
xrandr --output VGA-0 --mode 1368x768_60.00
# Load resources
Take note that the Xrandr settings should be changed to match yours, so before check your screen/s with the initial command