Hello and thanks for reading.  I have done some digging before posting this so let me explain my issue and then what I have tried.  I am using the Tinker Board S (via SD card, had same issue using EMMC img also) with the Bionic mainline kernel 4.14.y (in armbian config tool it shows Armbian 5.60 Stable ) on an LG 24LF452B montior/tv with the boards HDMI port and no adapters.  I have been trying to set the display resolution to 1366X768 or as close to it (it does not appear in the display setting