Nope, wasn't that change, instead this one:
ACPI: video: Ignore ACPI video devices that aren't present in hardware
50bcae78c21bf5c69d72ede68c8a00e12ab95618
I built the latest kernel without that commit, and now the backlight
control works ok.
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Ubuntu Kernel Team (ubuntu-kernel-team)
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Backlight adjustment no longer works on Thinkpad X61s
https://bugs.launchpad.net/bugs/197929
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