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Since I have upgraded from the last 11.10 to 12.04 the screen dim buttons ceased to function. As I see this is due to the replacement of the 3.0 kernel with the 3.2 starting the system with the 3.0.19 kernel screen dim works.

Anyone having similar experience?

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You should report this as a bug. – Eliah Kagan May 21 '12 at 17:24
Same problem on a toshiba portege. – Mittenchops Jul 16 '12 at 17:06

This script will automatically applies toshiba-acpi patch to your kernel.

sudo apt-add-repository ppa:keks9n/main

Update it.

sudo apt-get update

then install,

sudo apt-get install toshiba-acpi-fix

Check Settings

sudo toshset -q

for list of Toshiba settings

sudo toshset

I guess this will help you, I got the controls back using Fn key.

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