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Winmodem Device Does Not Work on Toshiba Portege 2000 After You Upgrade to Windows XP SP1
Article ID: 327804 - View products that this article applies to.
This article was previously published under Q327804
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
After you install Windows XP Service Pack 1 (SP1), the winmodem device no longer works on your Toshiba Portege 2000.
When you view the device in Device Manager, it is displayed with a yellow "!", which indicates that the device is experiencing problems.
The ALi chipset makes only one hardware ID available for the Audio Codec '97 (AC '97) controller. The available hardware ID is for audio. The audio driver also enumerates a child node for the modem. SP1 updates the audio node, which causes the issue for the winmodem device.
To resolve this issue, use one of the following methods. These methods are presented in order in which we recommend them.
Method 1: Use the Roll Back Driver Feature for the Audio Node
Method 2: Edit the Ltsmwxp.inf File and Update the Driver
Edit the Ltsmwxp.inf file
Update the Driver
Method 3: Edit the RegistryWARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.