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.

Consider the following scenario:

• You are running Windows Vista or Windows Server 2008 on a computer.
• You create a scheduled task to run at a given time.
• You configure the scheduled task to wake the computer to run.
• You put the computer in hibernation (S4).

In this scenario, the computer comes out of hibernation at the expected time. However, the scheduled task may not run as expected.

Consider the following scenario:

• You have a computer that is running Windows Vista Service Pack 1 (SP1) or Windows Server 2008.
• You let the system go idle for some time. Therefore, the monitor enters a low-power state, and the screen turns off.
• To wake up the monitor, you press the computer’s power button, or you use the remote control. The monitor resumes the full-power state, and the screen turns back on.

However, in this scenario, the monitor remains in the full-power state for only several seconds, and then it reverts to the low-power state.

Note: This issue does not occur when you wake up the monitor by pressing a key on the keyboard or by clicking the mouse.

Consider the following scenario:

• You are running a Windows Vista-based computer that has a Blu-ray optical device and an AMD SB700 reference board installed.
• You use an application such as Pwrtest.exe or Sleeper.exe to set an RTC wake-up time on the computer.

In this scenario, you cannot resume the computer from hibernation (S4) or from standby (S3). However, if you press any key or the power button, the system resumes correctly.

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:

• On a ThinkPad X300 computer that is running Windows Vista, you enable the Disable optical drive option on the Power Management tab.
• You perform a suspend-and-resume cycle or a hibernate-and-wake cycle on the computer.

In this scenario, the computer’s optical disk drive is intermittently not displayed in My Computer or in Device Manager.

After you wake a Windows Vista-based portable computer from hibernation, you may receive the following error message:

Windows BitLocker Drive Encryption Information
The system boot information has changed since BitLocker was enabled.
You must supply a BitLocker recovery password to start this system.
Confirm that the boot changes to this system are authorized.
If the changes to the boot system are trusted, then disable and re-enable BitLocker.
This will reset BitLocker to use the new boot information.
Otherwise, restore the system boot information.
ENTER=Continue
Operating System: Windows Vista

This problem occurs after you enable the BitLocker Drive Encryption feature on the portable computer and then put the computer in hibernation. This problem occurs even after you disable and then re-enable the BitLocker Drive Encryption feature, as suggested in the error message.

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.

You set a high definition (HD) audio controller not to wake a Windows Vista-based computer by using the Allow this Device to wake the Computer option in Windows Vista. However, the “wake on ring” (WOR) feature still wakes the computer from sleep and from hibernation.

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.