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We have a large TV at work - I connect my laptop to it to share my screen during meetings. Until today, my laptop display has been duplicating to the TV automatically when I connect the TV cable to the laptop. The display resolution would decrease automatically to be compatible with the TV.

Today, however, it's stopped working. When I connect the cable to the TV, the display extends rather than duplicating. Using the Win+P key combination (or Fn+F7 on my Lenovo laptop), I can choose to duplicate the display - but when I do this, it ends up only displaying on the laptop. I can get it to display on the TV by hitting Win+P and choosing "projector only", but then I can't see what I'm doing on the laptop screen.

I have a Lenovo W520 laptop running Windows 7, connected to the TV using a DisplayPort-to-HDMI converter cable. The TV's native resolution is 1280x720; the laptop's native resolution is 1600x900.

I've tried booting with the TV cable already connected; I've tried manually lowering the display resolution on the laptop to 1280x720 before duplicating the display. Neither works.

Does anyone have any other suggestions?

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You should have an icon in the lower right of your screen (taskbar) related to your graphics in your computer (Nvidia, Intel, etc.). Right-clicking that icon you should be able to get to something like "display settings", where you should find an option for cloning your display, or dual-display, or something like that. Using that option should restore the dual-monitor display function.

If that doesn't take care of it, it would be much more helpful to have your laptop's specs and configuration. Graphics card, info, etc.

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Thanks - I'm away from the office now but I'll try this tomorrow. The graphics card is an Nvidia Quadro 1000M. I see the multiple display options in the Nvidia control panel, I'll see if that works. – rbeier Sep 7 '11 at 3:15
Thanks - this worked. I went into the "set up multiple displays" section of the Nvidia control panel. Under "2. Drag the icons to match your display configuration", I right-clicked the TV (display #2) and chose "Duplicate with 1 (use 1 as source)". It seems to be remembering these settings now. – rbeier Sep 8 '11 at 1:21
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