Backlight brightness on Lenovo R61 won't go all the way down

I'm running a Lenovo ThinkPad R61 with an Intel GMA X3100 video card under Hardy 8.04.

The problem that I am experiencing is that the backlight can't be made to go below 20%. Back when I was using Gusty I was able to lower the backlight with xbacklight all the way from 100% to 0% (although not with gnome-power-manager). Now with Hardy I am no longer able to do this.

"echo 0 | sudo tee /sys/devices/virtual/backlight/acpi_video1/brightness" results an a screen that's about 20% bright

What makes me think that this is a bug is when I cat the file "/proc/acpi/video/VID1/LCD0/brightness" I get:

samantha@Alice:/proc/acpi/video/VID1/LCD0$ cat brightness
levels: 100 100 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 20

I would think that the file should read:

samantha@Alice:/proc/acpi/video/VID1/LCD0$ cat brightness
levels: 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 20

"echo 30 | sudo tee /proc/acpi/video/VID1/LCD0" results in the file reading:

samantha@Alice:/proc/acpi/video/VID1/LCD0$ cat brightness
levels: 100 100 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 30

yet, "echo 10 | sudo tee /proc/acpi/video/VID1/LCD0" results in the file reading:

samantha@Alice:/proc/acpi/video/VID1/LCD0$ cat brightness
levels: 100 100 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 20

This is important as the difference between the brightness being at 5 or 10 which is still very readable is over a Watt of power usage. Furthermore, a brightness of 20 is too bright for dark rooms.

Best Regards,
Samantha Davis