I don't now why this isn't working automatically. As an interim workaround, you could try using the xrandr --newmode command followed by the xrandr --addmode command. See xrandr --help for the parameters for those commands.
I don't now why this isn't working automatically. As an interim workaround, you could try using the xrandr --newmode command followed by the xrandr --addmode command. See xrandr --help for the parameters for those commands.