You disable a Peripheral Component Interconnect (PCI) device on a computer that is running Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2. However, the PCI device is enabled unexpectedly after you resume the system from hibernation.

Consider the following scenario:

• You have a computer that is running Windows Vista Service Pack 1 (SP1) or Windows Vista Service Pack 2 (SP2).
• That computer uses internal eHome Infrared Receiver.
• You resume the computer from hibernation.

In this scenario, a Windows Media Center remote control does not work. Additionally, you cannot find the eHome Infrared Receiver item in Device Manager. Instead, you find an Unknown device under Universal Serial Bus controllers. This issue also occurs when a Windows Vista-based computer changes from standby to hibernation when the hybrid sleep feature is enabled.

After resuming a computer running Windows Vista from sleep (S3) or hibernation (S4), with the monitor powered off, you cannot see a logon screen and will not be able to logon.

Windows Vista may fail to enumerate disk devices on an ATA Flash PC Card when resuming from hibernation. This behavior may be seen in the following scenario.

1. Insert a USB PC Card into laptop.
2. Allow the laptop to enter hibernation.
3. While the laptop is hibernated, remove the USB PC Card and replace it with the ATA Flash PC Card.
4. Resume from hibernation.

If you have a USB Streaming device attached to a computer running that is resuming from a Sleep (S3) or Hibernate (S4) state, the system may halt and you may receive a “Stop 0xFE” error message on a blue screen. This error message resembles the following:

STOP 0×000000FE (00000002, parameter2, parameter3, parameter4)
BUGCODE_USB_DRIVER

A hotfix is available for Windows Vista that addresses excessive power use during sleep or hibernation. This problem presents the following symptoms.

Symptom 1
If you put the computer to sleep or into hibernation when it is running on AC power, the high definition (HD) audio controller continues to use power. Additionally, even after the computer transitions to DC power while the computer is asleep or in hibernation, the HD audio controller still uses power. This behavior persists even though you disable the “Allow this device to wake the computer” option in the HD audio controller properties.

Symptom 2
After you disable the “Allow this device to wake the computer” option in the HD audio controller properties, the Wake on Ring feature still wakes the computer from sleep or hibernation.

Even after you apply hotfix 949514 on the computer, you still experience this problem.

Consider the following scenario:

• You run Windows Vista or Windows Server 2008 on a portable computer that has multiple hybrid graphics processing units (GPUs).
• A GPU mode transition occurs. This usually occurs when you unplug the AC power cord and the computer switches to power saving mode.
• You try to put the computer to sleep or into hibernation.

In this scenario, the computer crashes.

When you try put a Windows Vista x86-based computer or a Windows Server 2008 x86-based computer into hibernation, you receive the following Stop error:

Bugcheck code
STOP: 0×000000A0 INTERNAL_POWER_ERROR (a0)
The power policy manager experienced a fatal error.

Arguments
Arg1: 00000009, A fatal error occurred while preparing the hibernate file.
Arg2: c000009a, Status Code: STATUS_INSUFFICIENT_RESOURCES. Virtual memory cannot be allocated
Arg3: 00000000, Mirroring phase
Arg4: 00000000

Note: If arguments one and two in the error message that you receive do not match the arguments in this error message, it is likely that you are experiencing a different issue.

You experience the following issues on a computer that is running Windows Vista or Windows Server 2008.

Issue 1
Consider the following scenario:

• The computer supports hot-plugging of Peripheral Component Interconnect (PCI) Express graphics devices.
• On the computer, you install the driver for an external PCI Express hot-pluggable graphics device.
• You hot-plug the graphics device into the computer through a PCI Express cable or by using another method.

In this scenario, the external graphics device is not recognized the first time that it is hot-plugged. Or, the driver for the external graphics device is not loaded as expected, and you receive the following error message:

Incompatible Display Adapter is being disabled

Issue 2
Consider the following scenario:

• The computer supports hot-plugging of PCI Express graphics devices.
• The computer has an external PCI Express hot-pluggable graphics device.
• You connect multiple monitors to the computer.
• You configure a monitor on the external PCI Express graphics device as the primary monitor.
• You put the computer to sleep (S3) or into hibernation (S4).
• While the computer is asleep or in hibernation, you hot-unplug the PCI Express graphics device.
• You resume the computer from sleep or from hibernation.

In this scenario, you see a black screen. However, on a monitor that is connected to the internal graphics device, you expect to see either a logon dialog box or the desktop.

Note: These issues occur even after you apply hotfix 956756 on the computer.

Considering the following scenario:

• You have a Windows Vista-based or Windows Server 2008-based portable computer that is connected to an external monitor.
• You set the external monitor as the main monitor.
• The external monitor has a screen resolution that differs from the portable computer’s built-in monitor.
• You put the portable computer into sleep or in hibernation.
• You remove the external monitor.

In this scenario, when you wake the portable computer, the logon screen is not resized correctly. For example, the logon window may be smaller or larger than the screen on the portable computer.