
Open virtual terminal with Ctrl-alt-F1 and log in.Otherwise you get an error like xrandr: Configure crtc 0 failed. So you have to chain a sleep command before your xrandr command to give you time to switch back to the X server with Ctlr-alt-F7 so the command is executed there. The key thing is that xrandr apparently only works on the currently focused display. I scoured pages of Google search results before coming upon the solution, so I thought I'd share. So same problem as you, I need to set the resolution from the TTY1 virtual terminal I can reach with Ctrl-alt-F1, but xrandr doesn't seem to work. To make further adjustments, press and hold the “Menu” button while the monitor is off and turn the monitor back on to unlock the settings.Whenever I put my Lubuntu laptop to sleep when it's exclusively displaying on my TV and wake it up after having unplugged it, I end up with a black screen because the wrong resolution is assigned. Push the “Power” button to turn off the AOC monitor while holding down the “Menu” button to lock the settings. Select and adjust all OSD settings until the monitor is set up to your liking. Use the up or down buttons to select the “Exit” option to save the settings and exit the panel. Press the up or down button, located on the lower right corner of the front panel, to select an OSD setting, such as “Brightness” or “Contrast.” Push the up or down button to adjust the selected OSD setting to your liking. Push the “Menu” button on the lower right side of the AOC to access the monitor’s control panel. The power light will come on in the lower right corner of the front panel.

Push the “Power” button on the lower right side of the front panel to turn on the AOC. Insert the other end of the cable into the computer’s D-sub port and tighten the screws into place.

