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.

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.

You insert a DVD disk to watch a movie on a Windows Vista-based portable computer. You use Windows Media Player (Wmplayer.exe) or an application in Windows Media Center (Ehshell.exe) to watch the movie. However, the overall volume seems to be too low. For example, when you set maximum gain on all volume controls that are available in the audio mixer, system sounds and CD music playback are loud enough. However, DVD playback volume is still not loud enough.

Consider the following scenario:

• You are running a Windows Vista-based portable computer that has Bluetooth devices installed.
• You hot-plug a PCI ExpressCard device into the computer.
• You try to shut down or to restart the computer.

In this scenario, you may receive the following error message:

Stop: 0×0000008E (0xC0000005, 0×8A317B80, 0xA624B9E8, 0×00000000)
bthport.sys - Address 8A317B80 base at 8A2F6000, DataStamp 4578eb6e

When you use an application to transfer media from a computer that is running Windows Vista or Windows XP to a portable device, the memory for the application increases for each file that you transfer. The memory increase may cause the application to stop responding (hang) or to crash. This problem occurs when you transfer audio, video, or pictures.

When you use a portable Windows Vista-based computer, you may receive a Stop error message that resembles one of the following:

STOP: 0×000000E4 (0×00000002, parameter2, parameter3, parameter4)
STOP: 0×0000000A (parameter1, parameter2, parameter3, parameter4)

Notes:

• The parameters in the Stop error message vary, depending on the configuration of the computer and on the issue type.
• Not all “0×000000E4″ or “0×0000000A” Stop errors are caused by this problem.

This problem occurs if the following conditions are true:

• A USB camera device is integrated into the computer, or the device is connected to the computer through a USB cable.
• You resume the computer from long-term suspend mode. For example, the computer has been suspended for 30 minutes or more.
• The value of the computer’s ForceHCResetOnResume registry entry is 0.

When you press a keyboard (Hot Start) button to start a program, there is a delay before the program starts on a portable computer that is running Windows Vista. This problem occurs only when the computer is running on battery power.

When you start a portable Windows Vista-based computer that has the lid closed, you may receive a Stop error message that resembles the following:

STOP: 0×0000000A (parameter1, parameter2, parameter3, parameter4)
IRQL_NOT_LESS_OR_EQUAL

Note: This problem also occurs when you restart a portable Windows Vista-based computer that has the lid closed.

For example, this problem may occur if you have an external monitor or TV connected to the portable computer. In this scenario, the portable computer lid may be closed when you start the computer.

Consider the following scenario. You are running Windows Vista on a portable computer. You connect an external display to the computer, and then you configure the desktop area to extend across both displays. This configuration is known as “Extended desktop” mode. You turn off the computer, and then you start the computer while the lid is closed. Or, you start the computer, and then you quickly close the lid.

When you log on in this scenario, the resolution of the external display may unexpectedly change. The external display may not use the same resolution as was previously used.

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