I have now come to a workaround that I am happy with. 

I still have acpi enabled, and I no longer get backlight resetting.

You can see the details here (which is of course for my Toshiba)

http://docs.google.com/Doc?docid=dgd53r6d_36hqmmh4hn&hl=en

Meanwhile, upstream says this bug is probably fixed in the coming
xserver release, which I think means it will probably not be ported back
to Ubuntu 8.04 Hardy.  Debian Sid already shows better behaviour than
Hardy on my Toshiba, although I only get four levels of backlight
brightness from Sid.

-- 
Starting up a virtual machine in a virtualbox changes the display brightness 
(again)
https://bugs.launchpad.net/bugs/241195
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