Same problem Precision 5530 2-in-1 with 1.4.8 bios. In my case touchpad
is always working, keyboard will sometime came after 15-20 seconds.
Closing and opening lid will fix problem. Also if you enter password
with on screen keyboard (touchscreen) and get to gnome keyboard is
working again. Ubuntu 18.04 kernel 4.18, 4.19, 4.20 and 5
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https://bugs.launchpad.net/bugs/1822394
Title:
[Dell XPS 15 9575] laptop keyboard & touchpad not working at gdm
screen after boot
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