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SmartBook G138 display driver registry settings


Applies To

  • Windows CE .net 4.2


The SmartBook G138 contains an integrated VGA port operated by a Hitachi MediaQ MQ200 graphics controller. This article outlines how to adjust the Windows registy in order to modify the external VGA port resolutions used by the device.

More Info

The MQ200 chipset supports resolutions of up to 1280x1024 (UXGA) on an external monitor. The status of the external VGA port is controlled by which are also used to configure the 800x480 pixel internal LCD. It is important to remember that the MQ200 does not offer users a dual-head display configuration (where by the output on one display differs from the output on the main LCD).

There are three separate concepts at work in the configuration of the MQ200 video resolution.

Internal LCD resolution

The Internal LCD resolution, referred to as CxScreen and CyScreen specifies the fixed size of the SmartBook's internal display. These values should not be changed by the end user. If you misconfigure these values you may cause your device to initialise without internal LCD support, or force a hard reset.

External (D-Sub port) monitor resolution

Specifies the desired resolution of the external VGA port for use on your external monitor or projector.

Screen dimension boundary resolution

The digitiser boundary maps the difference between the Internal LCD and External monitor resolutions. If these values are altered, the logic behind the desktop resolution will change to reflect the specified size. If you specify a region higher than the physical dimensions of the screen, the outer regions of the screen will become mapped to pixels which do not physically exist. If you change the mapping to a lower resolution the display driver will crop the screen to the lower resolution, replacing the unused scpace with black bars.

How-to Guide

Before proceeding, please be sure that you have performed a full backup of your deivce.

WARNING: If you use a Registry Editor incorrectly, you may cause serious problems that may require you to hard reset your Handheld PC back to its factory installed configuration. Edit your Windows CE registry at your own risk.

Before you being, you need to know the output resolution that your external monitor will display. For the benefit of this article, a resolution for 1024x768 (XGA) will be assumed. For higher or lower resolutions the conventions outlined in this article are identical.


With thanks to chazco for working with us on this article