If you have too low resolution and you want to make a higher resolution, you can use xrandr. Examples: Computer reqognizes 1024x800 resolution when running xradr command. To test and set new resolutions: cvt 1280 1024 ... the output # 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz Modeline "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync .... to make a new resolution xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync xrandr --addmode VGA1 1280x1024_60.00 ... to test the resolution open Displays or run a command xrandr -s 1280x1024 Example 2: cvt 1366 768 ... the output # 1368x768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync .... to make a new resolution xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync xrandr --addmode VGA1 1368x768_60.00 ... to test the resolution open Displays or run a command xrandr -s 1368x768 NOTICE THAT xrandr can make so big resolution that you get a black resolution or some old display can literally explode, because it has no self-protection. If you get the black screen, press Ctrl F2 and Ctrl Alt Del for rebooting the computer.