A dual head wake up issue: black screen.

Discussion in 'Windows Vista General Discussion' started by Sumtec, Mar 29, 2008.

  1. Sumtec

    Sumtec Guest

    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)
    Sumtec, Mar 29, 2008
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