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How to extend desktop to another monitor that's shared with a different PC?

Posted on 2009-07-10
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Last Modified: 2013-11-06
1 Desktop w/ 1 LCD monitor
1 Laptop - Want to extend the laptop desktop to the LCD monitor to drag windows but still able to switch back to desktop display when needed.

Monitor has DVI and VGA inputs.

I have Desktop using VGA and Laptop using DVI. I'm able to get it working properly and switch from the desktop being displayed then to the laptop desktop extension using the monitors Digital / Analog input in the menu system.

The problem is the Digital Input (extension of the laptop) stops working after ~5-10 minutes and switches to analog (desktop). Then I'm unable to switch back to digital without rebooting the laptop. The laptop V-card is Radeon X600. I've tried changing out the DVI cable. Tried unplugging the VGA after the LCD monitor has switched off the Digital and only Analog is working. Then plugged back in the DVI and it still says no connection or no input and going to sleep with only the DVI connected from Laptop.

Is the V-card overheating?
Monitor inputs bad?
CPU not able to handle?
Not configured properly (I'm using windows settings to configure as I was not able to find software from ATI)?
Do you think a VGA switch with both computer going in and 1 output to the lcd would work? Or would I have the same problem? Or would the laptop not display on it's LCD screen when the VGA switch is set to the external LCD screen?
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Question by:Guest85
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by:rindi
ID: 24829529
Check for powersaving options on the laptop and turn them off. If that doesn't help look for driver updates,
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by:Guest85
ID: 24836121
Already checked for driver updates and I can check for power saving options on the Laptop but when it flickers the external LCD monitor off the DVI view (laptop extended desktop) I am using the Laptop. So I doubt it is the power saving options or the screensaver on either machine as I disabled them.
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by:a24hrpc
ID: 24842785
Try changing the power settings on the laptop to "Presentation"
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by:Guest85
ID: 24842902
Not sure if XP Pro has them? I didn't see them in Control Panel.
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by:a24hrpc
ID: 24842979
right click on desktop > properties > click screen saver tab > hit the power button > under the schemes drop down choose, "Presentation" Click "ok"
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Expert Comment

by:ahmad2121
ID: 24842989
Usually when it is not predictable, it maybe due to overheating issues, or perhaps outdated drivers.

Can you please visit http://support.amd.com/us/gpudownload/windows/Legacy/Pages/radeonmob_xp.aspx?type=2.4.2&product=2.4.2.3.5&lang=English

download the tool, get the latest cats for your laptop, install them and try again.
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Guest85 earned 0 total points
ID: 24920160
Tried all of those things and the problem continued. Tried drivers from manufacturer, presentation mode, no power saving options, etc. Co-worker just went ahead and got a VGA switch and that works great with a switch between the two computers displayed on the external monitor. Thanks for trying though. I know this isn't the best solution as we didn't figure out what the problem was (DVI laptop output, DVI monitor input, or maybe the monitor is bad or has a bug) but it will work in our situation.
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