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The touchscreen IR is not always-on (it's a protocol of on-off) and entirely too weak to be visible. For most IR applications you can "see" it with a digital camera (e.g. Wii Sensor Bar, find dozens of videos of that on youtube) but with the IR touchscreen... there's just nothing. That's also why IR touchscreen problems are so incredibly hard to pin down, no way to verify where things are going wrong. If someone managed to catch one of those ereader IR emitters doing anything on camera, I missed it.
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