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  • The real root cause of this problem is likely solvable by unplugging the misbehaving device plugged: actually, there is no device that is plugged in. This is the thing that makes it weird. Commented Feb 1, 2019 at 12:54
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    @AniketSahrawat: there must be some device that is plugged in. It is most likely some onboard device like Bluetooth module or TPM chip - you may need to have this internal chip replaced or send laptop to be repaired by warranty. That said, I recommend trying uhubctl, it might just detect your device and allow to disable it. Commented Feb 1, 2019 at 19:43
  • @ElderGeek It was a XY problem, sorry for the confusion. After digging in, its now clear that the problem is with touchscreen and not the usb port. Any suggestions on it? Commented Feb 2, 2019 at 16:22
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    @AniketSahrawat There is in fact a device plugged in: The touchscreen! This is plugged in using small cables internal to the workings of your computer. To unplug it, you will need to disassemble your computer, identify the touch screen cable, and unplug it. You may find, however, that the touchscreen and the display cable are integrated together. Commented Feb 2, 2019 at 16:35
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    @CharlesGreen There is in fact a device plugged in: The touchscreen!. It is now clear that the device is in fact touchscreen. But it was the whole confusion prior to digging into xorg.log. Even you have read my previous question and I am sure that there was no clue that the device which is misbehaving is a touchscreen. And as a reply to your comment, I don't want to mess up with the hardware. Commented Feb 2, 2019 at 16:44