Problem running 2 monitors (1 Viewer)


New Member
December 3, 2013
United States of America United States of America
Win7 home 64 bit. Having a problem driving 2 monitors simultaneously, duplicated (as opposed to spreading the desktop across the 2), despite both running fine individually under the same resolution/refresh rate (1280 x 720 @ 60 Hz.)

Vid card:

Desktop/2ndary monitor, via VGA:

HTPC/Primary monitor, via DVI:

If I disconnect either monitor (run only ONE) & boot, PC goes to 1280/720/60Hz & all is fine on the connected monitor. If I connect BOTH, PC goes to 800 x 600 60 Hz & refuses to allow another setting (resolution is dimmed in control panel). I am running ATI Catalyst, something I've wrestled with on 2 PC's with setups like this one, and which I have always found to be an extremely frustrating, unintuitive utility. If the answer lies there, I can't figure it out. Is there an alternative to Catalyst? Tried uninstalling Catalyst & drivers twice & reinstalling, no help. Anyone have any ideas?




Portal Pro
December 16, 2010
Germany Germany
As far as I know, it is not possible to duplicate with two different resoution. Only solution is to extend your dektop setup.

By the way... why don't you have connected your TV over HDMI and your monitor over DVI?


Test Group
  • Team MediaPortal
  • August 30, 2009
    Germany, Mayence
    Russian Federation Russian Federation
    Country flag
    from your link to pnasonic PDP
    Supported computer resolutions
    640 x 480 (VGA),
    800 x 600 (SVGA),
    1280 x 1024 (SXGA),
    1024 x 768 (XGA)
    so it doesn't support 1280 x 720. And windows selects the max resolution that is supported by both displays

    P.S. sorry, have overlooked that you have connected it over HDMI (assuming you have DVI-HDMI adapter) - in that case it should work

    Have you tried to configure your monitors as extended desktop? that way you will get independent settings for both monitors. Then you can try to set same resolution/refresh/color depth for both monitors. and after that you can try to switch to clone mode.
    Last edited:

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