Add missing Monitor Resolution profile

Edit on Github
linux/monitor_custom_resolution.md
Jan 21, 2019
Linux

tl;dr

  1. get Modeline cvt 1366 768
  2. create and add new mode with xrandr based on the generated modeline
  3. add settings to ~/.xprofile to preserve them, so the settings are still there when you restart
# Add 1366x768@60Hz
xrandr --newmode "1368x768"  85.86  1368 1440 1584 1800  768 769 772 795  -HSync +Vsync
xrandr --addmode VGA-1 1368x768
xrandr --output VGA-1 --mode 1368x768

get Modeline

cvt 1366 768

# 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

create and add mode

# Add the resolution supported by Acer Aspire 5742 on VGA port
xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
xrandr --addmode VGA-1 1368x768_60.00

# find the monitor identifier to set the mode for
xrandr --listmonitors

Monitors: 2
 0: +*LVDS-1 1366/344x768/194+0+0  LVDS-1
 1: +VGA-1 1024/271x768/203+1366+0  VGA-1

set output mode

xrandr --output VGA-1 --mode 1368x768_60.00

create .xprofile

Create a ~/.xprofile file and simply add the commands for the programs you wish to start with the session

touch ${HOME}/.xprofile
echo "
# Add the resolution supported by Acer Aspire 5742 on VGA port
xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
xrandr --addmode VGA-1 1368x768_60.00
xrandr --output VGA-1 --mode 1368x768_60.00
" >> ${HOME}/.xprofile

Troubleshooting

  • if the resolution is not working, try changing the frequency. You can specify the frequency when getting modeline with the gtf command
gtf 1366 768 30 -x

# get video controller details
sudo lshw -C video