I performed a test with linux-image-5.6.0-1007-oem from focal-proposed.
The brightness control works without problem on that version.  So the
problem seems to be fixed on linux-oem-5.6.

Is the version going to make it to the focal release?

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https://bugs.launchpad.net/bugs/1871330

Title:
  Dell XPS 13 (7390) brightness is not adjustable with recent kernel
  update

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