I know it it is a pretty miserable fix, but:

1) I seem to get all the various brightness levels with this modifications on 
my X61 Tablet, model 7764-CTO
2) acpi-support is installed; I can run acpi_fakekey, but acpi_fakekey 224 or 
225 does nothing, and does not generate any entries in /var/log/acpid

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LCD Brightness buttons do not work on Thinkpad X61 Tablet
https://bugs.launchpad.net/bugs/172985
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