Comment 7 for bug 172985

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