I also see no change with BIOS 1.10.0 on Eoan (though with kernel 5.3
due to an unrelated issue; I ran 5.4 and 5.5 before with the 1.7.1 BIOS
and had the problem with all three kernels).

I also noticed that though I have the problem just for ca 13 secs most
of the time, occasionally it never seems to start working (I waited more
than a minute).

However, a few times recently I sent the laptop to sleep with the power
button while the problem was occurring. The power button works even when
the keyboard does not, and on wake-up the problem was gone. It is
possible that I happened to press the button exactly when the keyboard
would have worked anyway, but as the procedure helped every time this
seems unlikely. Can anyone confirm?

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https://bugs.launchpad.net/bugs/1822394

Title:
  [Dell BIOSes dated 27 Mar 2019, XPS 9575, Precision 5530 2-in-1]
  laptop keyboard & touchpad not working at gdm screen after boot

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