I. Summary of changes
Version 1.00

• (New) Support to enable the multiprocessor HAL problem fix

Version 1.01

• (New) Update for ThinkPad Software Installer Support on Windows XP SP2

II. Installation Instructions
Note: ThinkPad Software Installer provides install/uninstall wizard for the device driver in the following operating systems:

• Windows 2000
• Windows XP

Windows XP SP 2 or later
How to enable the fix

1. Extract this package to your hard drive.
2. Click Start and click Run...
3. In the Open field type, C:\DRIVERS\WXP\MPHALFIX\XPSP2\enablefix.reg.

How to disable the fix

1. Extract this package to your hard drive.
2. Click Start and click Run...
3. In the Open field type, C:\DRIVERS\WXP\MPHALFIX\XPSP2\disablefix.reg.

Windows XP SP 1
Note: Before enabling the fix, you have to install QFE 835730, Multiprocessor HAL Problem Fix. If you use the preinstalled operating system image, it is available under C:\IBMTOOLS\OSFIXES\WXPUP\Q835730

How to enable the fix

1. Right-click My Computer, and click Properties.
2. Click the Advanced tab, and click Settings under Startup and Recovery.
3. Click Edit under System startup and open Notepad.
4. Add the /usepmtimer switch to the entry of [operating systems] section. The following is a sample of BOOT.INI file after adding the /usepmtimer switch.
   
   [boot loader]
   timeout=30
   default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
   [operating systems]
   multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /usepmtimer
   
   Note: * If there are two or more entries, add it to an entry to fix.
5. Save BOOT.INI file and close Notepad.
6. Reboot the system.

Note: On Windows XP Professional SP1, you can utilize the bootcfg command. EnableFix.bat in the C:\DRIVERS\WXP\MPHALFIX\XPSP1 folder is a sample of how to use bootcfg. You can use it to enable the fix for the boot ID 1 entry instead of the above steps.

How to disable the fix

1. Right-click My Computer, and click Properties.
2. Click the Advanced tab, and click Settings under Startup and Recovery.
3. Click Edit under System startup and open Notepad.
4. Delete the /usepmtimer switch from entry of [operating systems] section.
5. Save the BOOT.INI file and close Notepad.
6. Reboot the system.