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On a new XPS 15 9575 2-in-1 with BIOS 1.8.1, the symptoms are similar to comment #24. At the gdm login screen, the keyboard doesn't work at first but is OK after 20-30 seconds. The touchpad is not affected. The Linux 4.15 kernel is not affected but later ones are. I tried it with 4.18, 5.0 and 5.3 kernels. I am running Mint 19.2, which uses the Ubuntu kernels.
If I boot in recovery mode, the keyboard works on the recovery mode menu. If I then exit to normal boot, the unresponsive keyboard recurs. However, the elapsed time until it starts working
again is from the initial boot. That is, if I wait 30 seconds in recovery mode before exiting to normal boot, the keyboard will then be working at the gdm screen.