I just installed Ubuntu. I am new to Linux, so I will need this explained in pretty basic terms please. I have two monitors. I use a AMD R7 2xx graphics card. I haven't installed the AMD drivers but don't know if I need to or not. In terminal I used the command xrandr --addmode DVI-0 1600x900 to add that resolution to my second monitor. It works fine until I restart the computer. I read something about needing to change a xorg file in /etc/X11, but that directory doesn't exist on my computer. Not sure what to do.
Ubuntu – xrandr not saving settings permanetly in Ubuntu 14.04
atigraphicsresolutionscreenxrandr
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So I googled around a little more and after trying a few things I found that xrandr doesn't quite work well nvidia proprietary drivers, so I had to use :
sudo nvidia-xconfig
to generate a xorg.conf in /etc/X11/xorg.conf
I then googled around for the HorizSync and VertRefresh values for the monitor in question which I found to be:
HorizSync 30 - 83
VertRefresh 56-75
So I found in my xorg.conf where the monitor was, at this block and made the changes:
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30 - 83
VertRefresh 56 - 75
Option "DPMS"
EndSection
then I restart lightdm:
sudo systemctl restart lightdm
Checked the display settings again and...Bam! there is was.
Best Answer
You can add
to
/etc/lightdm/lightdm.confin[seat defaults]section.This will ensure it starts before you login into the system.
It also can be done in xorg.conf file, or better in a new file in
/usr/share/X11/xorg.conf.d/<50-some_name.conf>