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Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

This hotfix rollup fixes several problems and provides some improvements for the USB audio driver.

This hotfix rollup fixes the following problems:

• Some legacy USB MIDI devices do not appear in Windows Vista or in Windows Server 2008. These USB MIDI devices correctly appear in Windows XP.
• Some USB Audio devices display incorrect device names.
• In a USB Audio device, you cannot select the output source of a multiplexer (MUX) processing unit.
• A USB Audio device does not log to the same location as the Audio engine does.
• Surprise removal of a USB Audio device causes an application to stop responding or to use 100% of the CPU.
• The USB Audio driver incorrectly maps the center frequency to an incorrect value.
• The USB Audio driver cannot set a specific mode for a processing unit node.

This hotfix rollup includes the following improvements:

• The USB Bus drive can store a device startup failure.
• The USB device can save and restore the MIDI Processing Unit (MPU) state.
• The USB Audio driver can lock the AVStream queue on entry to standby or on exit from standby.
• The process for determining whether a USB Audio device is a communications device has been refined.

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