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.

Consider the following scenario:

• You are running Windows Vista on a portable computer.
• The screen resolution is set to a resolution that is greater than 1024 × 768.
• You close the lid of the computer, and then it enters sleep mode.

In this scenario, when you open the lid of the computer to resume from sleep mode, the resolution changes to 1024 × 768.

This problem does not occur on desktop computers. Also, this does not occur on a portable computer when you use the Start menu to put the computer into sleep mode.

When a Windows Vista-based computer is in hybrid sleep mode, the Wake On LAN (WOL) functionality may not wake the computer from hybrid sleep. This problem may occur in both wired and wireless network environments.

Consider the following scenario. You enable the hybrid sleep feature on a Windows Vista-based computer. The computer has PS/2 devices that are connected. The computer experiences a power loss. In this scenario, the PS/2 devices may not function when the computer resumes power.

Consider the following scenario:

• A Windows Vista-based computer is awakened from sleep by a magic packet.
• The WakeOnLAN feature is enabled on the computer.

In this scenario, the computer desktop is displayed unexpectedly.

Note: For more information about magic packets, see the “More information” section.

The tenth tip video by PCWizKid. Change the behavior of your Windows Vista power button on the menu from sleep to Shutdown for example with these easy steps.

Consider the following scenario:

• You watch live TV or a DVD in Windows Media Center on a Windows Vista Home Premium-based computer or on a Windows Vista Ultimate-based computer.
• You pause the live TV program or the DVD.
• You use the Start menu, a sleep button on the keyboard, or a Windows Media Center remote control to put the computer to sleep.
• You wake the computer, and then you try to continue watching the live TV program or the DVD.

In this scenario, you can view the video part of the live TV program or of the DVD. However, you cannot hear the accompanying audio.