Monday, March 7, 2011

Disable video acceleration to troubleshoot problems with AutoCAD or AutoCAD LT


One or more of the following problems occurs while you are using AutoCAD® or AutoCAD LT® software:
  • Objects or lines do not disappear after they have been erased.
  • Objects or lines are not displayed after they have been drawn.
  • The system locks up without any error message or warning.
  • The system locks up when you execute commands that require a display regeneration (such as Real-Time Pan or moving objects in the drawing).


These problems may be due to defects in the video driver. These are problems that can occur when video acceleration is enabled.
To determine if the problem is related to the video card, you can disable video acceleration.
To disable video acceleration:
For Microsoft® Windows® 95, Windows 98, and Windows NT® 4.0
Note: These operating systems are not supported for all AutoCAD products and versions related to this solution. See the System Requirements for your version of the product for more information
  1. On the Start menu (Windows), click Settings > Control Panel.
  2. In the Control Panel, double-click the System icon.
  3. In the System Properties dialog box, click the Performance tab.
  4. On the Performance tab, click Graphics.
  5. Under Application Performance, move the slider all the way to the left to completely disable video acceleration.
For Microsoft Windows 2000 and Windows XP
  1. Right-click on the desktop and click Properties on the shortcut menu.
  2. In the System Properties dialog box, Advanced tab, click Advanced.
  3. In the New dialog box, click the Troubleshooting tab.
  4. Move the slider all the way to the left to disable video acceleration.
The number of levels of acceleration will depend on the operating system and driver. Refer to the information in the dialog box for a description of what each level does.
If disabling the video acceleration seems to take care of your problem, then you will probably want to get an updated driver for your video card to actually fix the problem. Until then, you can start moving the accelerator one stage at a time to the right until the problem reappears.

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