Lenovo ThinkPad 770E-ED TP 770X User's Reference that shipped with the system - Page 164
Problem, Cause and Action, Infrared device, connector
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Troubleshooting Charts Problem Incorrect data is sent between your computer and a communicating device. You cannot use DMA channels for both the parallel connector and the infrared port. Cause and Action Make sure that: The distance and angle between your computer and the device is within the set range. The communication speeds are the same. There are no other devices that radiate infrared rays, such as remote-controlled devices or wireless headphones, near your computer or the communicating device. You are not operating under direct sunlight. No fluorescent lamps are near your computer or the communicating device. If you enable ECP and choose DMA3 (the default value) for the parallel connector, you might be prompted if you want to disable DMA for the infrared port. To use DMA channels for both the parallel and infrared ports, do the following: 1. Click on OK to disable DMA for the infrared port. 2. Close a parallel port panel. 3. Click on the Infrared device button to open the infrared panel. 4. Choose DMA0 or DMA1 for infrared port on the panel. 5. If you see the panel prompting if you want to disable DMA for an audio device, click on OK. 150 IBM ThinkPad 770X User's Reference