Can't get maximum resolution from monitor

Discussion in 'Fujitsu' started by utopian201, Dec 16, 2015.

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  1. utopian201

    utopian201 Scribbler - Standard Member

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    Hi
    I have an old VGA monitor with a maximum resolution of 2048x1536. It works on my old desktop (running windows 7) via VGA. The monitor driver used is Generic PnP Monitor and all of the monitor modes are listed.

    However when I use it on my T734 (running windows 10), the maximum resolution is 1280x1024. There are no x64 compatible drivers for this monitor (but it shouldn't matter as the Generic PnP monitor driver works fine on my windows 7 desktop).

    I have used my VGA output on an LCD which has a native resolution of 1680x1050, so I know the VGA is capable of more than 1280x1024.

    Is there anything else I should try? I have the latest intel drivers, but that shouldn't matter as it has output at 1680x1050 on my lcd.
     
    Last edited: Dec 16, 2015
  2. utopian201

    utopian201 Scribbler - Standard Member

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    After some more research, it appears that it is limited due to the Haswell's VGA DAC (Digital to Analog converter). It is limited to 180Mhz, whereas on my desktop, the DAC on the integrated Intel graphics is 400Mhz.

    When I use the Intel drivers to specify a custom resolution of 1600x1200@60hz, it works, but 1600x1200@75hz fails with the error "The custom resolution exceeds the maximum bandwidth capacity".
    There is no option for CVT-RB (Reduced blanking) as the blanking interval is required for CRTs to function properly.
     
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