After you resume a Windows Vista-based DHCP client computer from sleep or from hibernation, the computer may lose its IP address. This problem may occur if there is more than one network interface on the computer, such as a real network interface and a virtual private network (VPN) interface.

For example, consider the following scenario:

• On a Windows Vista-based DHCP client computer, you establish a Secure Sockets Layer (SSL) VPN connection to a remote VPN server.
• You disconnect the SSL VPN connection.
• You put the computer to sleep or into hibernation.
• You resume the computer from sleep or from hibernation.

In this scenario, the computer loses the IP address that was assigned to it by the DHCP server. Instead, an Automatic Private IP Addressing (APIPA) address, such as 169.254.0.1, is assigned to the client computer. Therefore, you cannot access some network resources.

When Sound Recorder is running on a Windows Vista-based computer, the computer does not go to sleep regardless of how long the system is otherwise idle.

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There are key differences between Windows XP and Windows Vista where power-management functionality is concerned. One of these differences concerns how the Windows Vista power-management feature works for the HD audio controller and for any child devices. For example, assume that you decide to disable an HD audio controller’s Wake on Ring feature on a Windows Vista-based computer by disabling the Allow this Device to wake the Computer option. In this situation, the Wake on Ring feature still wakes the computer from sleep and from hibernation.

Consider the following scenario:

• You are using a Trusted Platform Module (TPM) chip on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1 (SP1).
• You put the computer to sleep, and then you resume it from sleep.

In this scenario, the following errors may be logged in the System log every 40 minutes:

Event ID: 13
Event Source: TPM
Event Type: Error
Event Description: The device driver for the Trusted Platform Module (TPM) encountered a non-recoverable error in the TPM hardware, which prevents TPM services (such as data encryption) from being used. For further help, please contact the computer manufacturer.

Event ID: 516
Event Source: TBS
Event Type: Error
Event Description: An error occurred while communicating with the TPM. The driver returned 0×8007045d.

The TPM driver and the TPM Base Services (TBS) log these errors when they try to obtain a random number from the TPM chip for the Windows operating system. The operating system uses this random number as an additional source of entropy when the operating system’s cryptographic methods generate random numbers.

Additionally, if the TBS sends other commands to the TPM chip after the computer resumes from sleep and if the operating system receives a “TPM_NEEDS_SELFTEST” response from the TPM, the operating system may be unable to use the TPM chip to generate random numbers for additional entropy.

When you try to put a Windows Vista-based computer to sleep while a dial-up network connection is active, the computer may crash. Additionally, you receive a Stop error message that resembles the following:

STOP: 0×0000009F (parameter1, parameter2, parameter3, parameter4)
DRIVER_POWER_STATE_FAILURE

This issue occurs even if you have installed hotfix 931671 on the computer.

Consider the following scenario:

• You use a Windows Vista-based computer that has a USB microphone device.
• You open the Sound and Multimedia tool (Mmsys.cpl).
• The computer enters sleep or hibernation.

In this scenario, when the computer resumes from sleep or from hibernation, you cannot use the USB microphone device to record audio.

Note: A built-in microphone may be attached by using a USB connection internally. In this scenario, you may also experience this symptom.

When a RunSynchronous command runs for a long time during the audit mode of an unattended Windows Vista installation, the Windows Vista-based computer may enter a sleep state. In this scenario, if the administrator password is not set, the computer does not resume from sleep automatically. The computer may be permanently locked, and you may have to reinstall the operating system to recover.