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Service Hints & Tips

Document ID: AGRN-46AMCE

TP 770X,770Z - External Display appears twice in Windows 98 Device Manager

Applicable to: World-Wide

SYMPTOM:
A Plug and Play external monitor appears twice in Windows 98 Device Manager under monitors on ThinkPad 770X and 770Z systems. This only occurs when the ThinkPad is boot for the very first time on the docking station and the external display monitor is attached to the docking station.

CONFIGURATION:
Windows 98, ThinkPad 770 with dual display capabilities, plug and play monitor.

SOLUTION:
1) Do not attach the external plug and play monitor to the dock until after the ThinkPad is fully configured stand alone on an empty dock. Then add the monitor and it will detect and add the external display only once. The ThinkPad's display should appear in Device Manager as Laptop display panel...

2) If you have already established a docking station hardware profile that shows 2 external monitors erroneously and you would like to correct this, it is recommended to use the following procedure to remove the existing docking station hardware profile and create a new one.

• Shut down the ThinkPad and remove it from the docking station
• Remove the external display connector from the docking station
• Reboot the ThinkPad off the docking station as a standalone unit.
• Once fully boot into Windows 98 remove the docking station hardware profile
• Click the Start Button
• Select the Settings menu option
• Click the Control Panel menu option
• Click the System icon
• Click the Hardware Profiles tab
• Select the appropriate profile by clicking on the profile name in the list. The default name is usually dock1, but this can be altered.
• Click the delete button
• Click the OK button
• Shut down the machine
• Reattach machine to the docking station - do not have external display attached
• Reboot system normally and follow any prompts to build a new docking station hardware profile
• After new hardware profile completes, shut down ThinkPad and attach external display.
• Reboot

	Search Keywords
	Hint Category	Display/Monitor, Hardware Installation/Configuration
	Date Created	24-03-99
	Last Updated	13-04-99
	Revision Date	13-04-2000
	Brand	IBM ThinkPad
	Product Family	ThinkPad 770X, ThinkPad 770Z
	Machine Type	9549, 9544
	Model	various
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes