Confirm on a Thinkpad T43p.

Booting with the noacpi option still has this problem.

A workaround (to avoid going insane...) is to open the Power Mgmt
preferences from gnome-control-center, and under your current setup (ie
AC power), slide the brightness slider all the way up to 100%, then
lower it back down to 95%.  Close g-c-c, and it will stay at 95%
brightness for the rest of the day.  However, if you touch the
brightness keys at all, it falls back to only the two lowest settings,
unless you open g-c-c and do that over again.

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[Feisty] Thinkpad R51 LCD brightness control cycles between lowest settings only
https://launchpad.net/bugs/81407

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