Monitor causes strangely high CPU usage

Discussion in 'Windows Vista General Discussion' started by rf13, Mar 30, 2009.

  1. rf13

    rf13 Guest

    My computer (Dell XPS 1330) runs fine without the monitor (Dell 20"
    SP2008WFP) but intermittently hits 100% CPU usage with the monitor
    plugged in - usually if I am running more than 3 or 4 standard office
    programmes - and then returns to running normally if the monitor is
    unplugged. I have 4GB of RAM and 2 x 2.5 GHz processors, so don't think
    this should be a problem. The laptop and monitor seemed to work fine
    together for a few months but subsequently the problem got progressively
    worse over a few months.

    I have tried stopping all processes in TM when the problem occurs -
    none stand out as being the culprit. The only common occurrence is that
    the task manager process itself runs at 20%+ to 40% CPU usage when the
    problem occurs. I have already tried defragging, spyware, cutting out
    all visual effects and all sorts of other performance improvement
    options - I even totally reformatted the hard disk before I realised
    that the problem was related to the monitor being plugged in! I have
    tried rolling back and then re-updating the drivers for the monitor and
    the display adapters, but the problem persisted. Any idea of other ways
    of attempting to solve this problem?
    rf13, Mar 30, 2009
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  2. You might want to check to see if Dell has an updated driver for that
    monitor. Look especially for one that is Vista compatible. While my
    pre-Vista monitor is not having any problems another might.
    Joseph Meehan, Mar 30, 2009
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  3. rf13

    LVTravel Guest

    Since you are plugging in the monitor to a laptop what is probably happening
    is the "marginal" video capability of the video card in the computer is
    having problems pushing the appropriate signal to the monitor and the
    laptop's screen. I wouldn't blame it totally on the monitor (try a
    different monitor under the same situation to rule out) but the video system
    in the laptop. Follow Joseph's advice to see if there is an updated driver
    for the onboard video adapter in the computer. You may also try adjusting
    the memory allocation to the video system (in the bios) to see if that

    Only other suggestion would be to switch the laptop's display off and use
    just the external port (FN + whatever F key toggles the display.)
    LVTravel, Mar 30, 2009
  4. rf13

    Charlie Tame Guest

    I had a similar odd problem last week with an XP machine, HP Desktop.

    Someone bought an Acer LCD for it and adjusted the resolution down, that
    worked okay but she didn't like it and then tried to go back up. No go,
    everything "Grayed" out, resolution stuck around 640X480 and 4 colors or
    something stupid. System was reporting "Plug and Play" monitor.

    Several reboots, still no go, monitor not identified.

    Downloaded driver from Acer and bingo, problem solved after a reboot.
    Methinks maybe she set a resolution that monitor cannot do and the
    driver fell over or something.

    Never seen XP do that before so maybe we are entering a period where
    XP's normally excellent P&P handling is going downhill?

    Anyway, not Vista related really but it does illustrate that monitor
    drivers can cause other problems, something one might not expect,
    especially the inability to change resolution when it had worked fine

    So in this case I suggest checking both Video and Monitor drivers with
    manufacturer's websites, and if no go try Windows update with optional
    updates enabled instead of "Express", just in case there is something there.
    Charlie Tame, Mar 30, 2009
  5. rf13

    rf13 Guest

    Thanks LVTrave

    I have updated to all the latest video adapter drivers and monito

    I switched the laptop screen off a while a go and am working from th
    monitor alone, but still have the proble

    Will try plugging in another monitor if i get the chance

    I dont know how to adjust the memory allocation in the BIOS?

    current allocation is as follows - i think this is what you ar
    referring to

    total avail;able graphics memory - 1663m
    dedicated video memory - 128m
    system video memory 0m
    shared system memory 1535m
    rf13, Mar 30, 2009
  6. rf13

    rf13 Guest

    have updated to latest drivers but no result, thanks
    rf13, Mar 30, 2009
  7. rf13

    V Green Guest

    Are you running BOTH (internal & external) at
    the same time?

    You never really say...
    V Green, Mar 31, 2009
  8. rf13

    rf13 Guest

    yes, I am using an external hard drive, just to backup files
    rf13, Mar 31, 2009
  9. rf13

    LVTravel Guest

    The poster meant laptop's video and external monitor at the same time.
    LVTravel, Mar 31, 2009
  10. rf13

    rf13 Guest

    no - I stopped using both monitors at the same tim
    rf13, Mar 31, 2009
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