KVM Switch not working

(Sorry, I had this posted in the wrong forum...)

I'm still setting up my new MacBook Pro laptop. I thought it would be nice to take advantage of my 21" PC monitor while I'm at home, so I purchased my first KVM switch.

I plugged everything in as instructed, and it appears to be working at about 75%. In other words, I can use my mouse and keyboard with my PC just fine, and when I click the Scroll Lock key twice, the monitor shifts to Apple mode; it has the same bluish background my laptop does.

However, it doesn't display anything I see on my laptop's built-in monitor - the menu bar, open programs, etc. Curiously, it displays one folder, titled "untitled folder 3." My mouse works, though there's nothing for it to manipulate, save one empty folder. I can't tell if the keyboard works or not. The trackpad that's built into my laptop also works on my PC monitor. In other words, I can move the cursor on my larger PC monitor with either the mouse or the trackpad.

Next, I reversed the wires, plugging the PC into the KVM node that had formerly connected to my MacBook Pro and vice versa. The results are pretty much the same, except that now when I toggle to Apple mode, my mouse moves the cursor on the laptop's built in monitor, not on the larger PC monitor. Also, my MacBook told me it didn't recognize my keyboard, so I replaced it with a Mac-compatible keyboard. (I learned how to do the hot key trick so I can toggle by hitting the CTRL key twice.)

So my KVM switch is obviously almost working. I just have to convince my laptop to ignore its built in monitor and display everything on my PC monitor, not just one empty folder. Can anyone tell me what's going on, and how to fix it?

Incidentally, how are MacBook Pros normally connected to larger PC monitors? My computer came with a VGA adapter so it could be connected to such a monitor. When they're connected, does one ordinarily see the same display on both the laptop and the larger monitor, or is there some way to channel the display through the larger monitor only?

Thanks.

MacBook Pro

Posted on Jul 27, 2006 8:28 PM

Reply
2 replies

Jul 27, 2006 10:19 PM in response to David Blomstrom

Hi David,

It sounds like your MacBook Pro is going into "extended display" mode which means that the external 21" PC monitor is acting as an extension to the MacBook Pro's display - you can move the cursor from one monitor to the other by going past the edge of the display (then the cursor seamlessly goes to the other monitor). It's kind of hard to explain but try moving the cursor to every side of the monitor it's currently on. 3 of the sides will act normal, but on one side the cursor will probably appear to keep going past it and disappear. Then if you look on the other monitor, the cursor will probably be on it now.

Anyway, I just thought I'd explain what's going on that you're seeing now, well I think that's what you're seeing! 🙂 As for the solution, there are basically two things you can do:

One, you can make it so it's in display mirroring mode, so the same thing is displayed on both the internal MacBook Pro display and the external 21" display. To do that, get everything set up like you're seeing it currently (with the external monitor showing the single untitled folder) and then press the F7 key at the top of your MacBook Pro's built in keyboard. The key has two little rectangles on it--this key toggles between display mirroring and extended display.

The other option is to keep the MacBook Pro closed (on, but asleep) when you switch over to it through the KVM switch. Then press a key on the keyboard hooked to the KVM switch and your MacBook Pro should wake up, with everything showing on the external monitor. (This method of using the MacBook Pro with the display closed is perfectly fine and won't hurt your computer at all--I use it to watch DVDs when it's connected to my TV).

One last thing:
If you go to the Apple menu, then choose System Preferences, then click Displays (it's under the second row of buttons called "Hardware") there should be some information there that might help you see how the multiple monitors are behaving. When you're in extended display mode, it helps visualize why you can move the cursor from one monitor to the other so seamlessly 🙂

I hope this helps. If this doesn't help, please let me know so I can put my thinking cap back on for a while to figure out what your MacBook Pro is doing. 🙂

Doug

MacBook Pro 17" 2.16 GHz Mac OS X (10.4.7)

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KVM Switch not working

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