A dual head wake up issue: black screen.

I found a serious problem with my laptop. I searched on internet for this
issue for a long time but it seems like no body encounters this problem.
Here's the details to reproduce the problem:
1. Connect a monitor to the laptop and extend the desktop to the monitor;
2. Unplug the monitor;
3. Before the screen setting applies successfully, close the laptop to make
it turns into sleep mode;
4. Open the laptop to wake it up;
Then you will find everything is right except the screen on the laptop. It
will be black -- no mouse point, no windows, no desktop, even the backlight
is off.
I took a long time to figure out what's up. And finally I found that the
system set the external monitor as primary monitor in this case. Since
there's no output on screen, I can't do anything like setting the primary
monitor to laptop screen again. In fact, this will also happen in Windows XP.
However, I can press CRT/LCD switch key to fix up this issue in XP but not in
Vista. It seems that Vista disabled the CRT/LCD key when there is no external
monitor. That makes me crazy every time! What I can do with it, is press the
power button on the laptop for a long time to turn off the power directly.

Is this a known issue? Is there already a update for this issuue? Or does
any one has any solutions unlike press and hold the power key?

My OS/hardware info:
Dell 640m
Windows Vista Ultimate (no SP1, but KB update everyday)