Yes, the problem persists with the upstream kernel listed there:
(Linux test-Dell-System-XPS-L321X 3.4.0-030400rc1-generic #201203312035 SMP Sun
Apr 1 00:36:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux)
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/954661
Title:
backlight brightness not adjustable by default on Dell XPS 13
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