More investigation:
echo 60 > /sys/devices/virtual/backlight/acpi_video1/brightness
results in a dim screen and 
/sys/devices/virtual/backlight/acpi_video1/actual_brightness being 60.

echo 59 > /sys/devices/virtual/backlight/acpi_video1/brightness
results in a bright screen and 
/sys/devices/virtual/backlight/acpi_video1/actual_brightness being 100.

I think this is a kernel bug.

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[hardy] HP dv2500t brightness keys behave strangely
https://bugs.launchpad.net/bugs/178818
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