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    New 915resolution Insights
    Submitted By: admin Date: July 13, 2014, 10:35:09 PM Views: 735

    I've recently had to solve an interesting puzzle with an Atom D2500 system using an Intel GMA3600 graphics adapter. The problem was that although the laptop display itself supported a resolution of 1366x768, nothing I tried could persuade Xorg, and more specifically, Vesa, to accept a configuration that would drive the Desktop Environment at this resolution.

    I finally discovered why, and how to work within the limitations with which I was presented.

    Using 915resolution (along with uvesafb) means working within the bounds of 2 specific limitations:

    Code: [Select]
    1) what your display hardware supports in terms of resolution (the monitor/LVDS).
    2) what vesa modes are provided by the your vbios.

    For example, if your monitor/lvds supports a resolution of 1366x768, you cannot configure Xorg for a resolution that exceeds this hard limit in either the X or Y axes. In addition, if your vbios provides vesa modes that do not match this resolution, you must work with the modes you are given to find a resolution that works best within the confines of the 1366x768 resolution that represents your boundaries.

    Lets say your vbios provides you with the following modes:

    Code: [Select]
    640x480
    800x600
    1024x768
    1280x800
    1600x1200

    As you can see, 1366x768 is not provided and, in addition, none of the provided modes has a width of 1366 pixels.

    Given these parameters, there is nothing you can do to achieve Xorg support of 1366xanything.

    However, you can use the vesa modes provided to get the best resolution possible for your 1366x768 display hardware. In the case of this example, the following resolutions are possible to create using 915resolution, given the vesa modes provided by the vbios:

    Code: [Select]
    640x480
    800x480
    1024x480
    1280x480
    1600x480
    640x600
    800x600
    1024x600
    1280x600
    1600x600
    640x768
    800x768
    1024x768
    1280x768
    1600x768
    640x800
    800x800
    1024x800
    1280x800
    1600x800
    640x1200
    800x1200
    1024x1200
    1280x1200
    1600x1200

    Given the hard limitation of 1366x768 imposed by the display hardware, this list is reduced to the following:

    Code: [Select]
    640x480
    800x480
    1024x480
    1280x480
    640x600
    800x600
    1024x600
    1280x600
    640x768
    800x768
    1024x768
    1280x768

    This means that the maximum resolution you can possibly attain using 915resolution and uvesafb, given display hardware that supports a resolution of 1366x768, and given the vesa modes such as those I provided for this example, is 1280x768.

    This trick for using 915resolution in combination with uvesafb does not appear to be explained anywhere, so I hope this helps out.

    Cheers

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