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There may be such an event (lipc or otherwise, such as a /proc or /sys file), but it would probably be different for different kindle models, and perhaps different firmware versions within a given model (not unknown for lab126 to make such changes in the past).
You might be able to find what you seek in the GPL source code for your firmware version, or in the firmware update*.bin file (root filesystem extracted with Kindletool), or in the de-obfuscated (if required) .jar files within that rootfs.
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