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I am running the Debian distribution on a Manx PC104 embedded board. The board has a normal VGA video output that I have connected to a monitor and this works fine.
It also has an LVDS Panel Display output which is reported to be logically the same as the VGA. When I connect an LCD panel to this port here's what happens.
1) I see the Linux Penquin logo and the initial start text on both the VGA and LCD panel. So the hardware interface is working.
2) The system switches to a default wallpaper background. (I assume it has entered some graphics processing instead of text.) I continue to see the upper left quadrant of the picture on the LCD while the full screen is display on the VGA
3. Both screens blank except for a waiting icon on the VGA.
4 The VGA display goes to the final desktop with a Task bar on the bottom and, as it turns out, the browser covering most of screen. However the panel still remains blank.
5. When I shutdown the system. VGA graphics is replaced by the console text showing the final shutdown process. At this point, the panel comes alive again and shows a quadrant of the VGA screen.
My questions are:
1. How do I get the panel to remain active through the main graphics portion?
2. How do I adjust the system so the the panel show the entire display?
3. In short, how do I get the panel to mimic the VGA?
Distribution: Slackware 14.1 64-bit, Ubuntu 15.10, Fedora 17, Ubuntu 12 LTS and Ubuntu server 10.04
You want to mimic iow have 2 identical screens show up across both monitors? Or "extended" view with 1 monitor on the left, for instance, and the other on the right?
Have you tried using xrandr?
$ xrandr --output LVDS --below VGA
Will display the X output of LVDS "geographically below" the VGA X output. Use "xrandr --help" or "man xrandr" for more settings.
If the chip is nVidia, you could probably do this with the proprietary driver as well.
My problem was caused by a faulty setting in the CMOS EEPROM. The LCD was not enabled which is why it worked only part of the time. It certainly wasn't enabled with a resolution corresponding to the actual LCD,hence the truncated display.