On 01/07/2013 10:50 PM, dragorn wrote:
This is the opposite but the same trick should work:

http://old.nabble.com/How-to-disable-internal-LCD-in-a-static-configuration-on-a-DELL-Latitude-601-td28724336.html

So in your case, perhaps:

Section "Monitor"
     Identifier      "HDMI1"
     Option          "Disable"        "yes"
EndSection

Or whatever your DVI port is called (xrandr will tell you)

Yep, that fixed it (DVI-0). Would be nice if there were some on-board connector where I could att the DVI port and use that instead, but don't see any likely candidates.

I *had* been using a Matrox PCI video card, because I thought the on-board video was only 16MB (a re-purposed server, figured they didn't bother adding fancy graphics). Seems the BIOS screen was lying to me: when Mint14 decided it didn't want to work with the MGA G400, I had to switch back to the internal video, at which point I saw that "lspci -vv" told me the on-board had 128M. SO my poor resolution on the on-board was just due to a ghost DVI all along.

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