I can confirm this problem... Also using a SL400 with 9.04 and noticed
that the backlight buttons do not seem to function. When they are
pressed (either fn+home or fn+end) the backlight is set to 0 or 1 and
can only toggle between those two settings.

cat /sys/class/backlight/acpi_video0/brightness

The brightness settings do work at higher numbers

the fallowing will max it out. 
echo 13 > /sys/class/backlight/acpi_video0/brightness 

in 8.10 the brightness keys also were backwards, but you could always
increase the backlight by lowering it, now you can't even do that, but
the keys do seem to move it in the right direction (between 0 and 1)

-- 
thinkpad sl400 light control keys don't work
https://bugs.launchpad.net/bugs/348348
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