This proposed solution worked for me:
### SYSTEM INFO ###
# Model: Toshiba SATELLITE R830
# Kernel: 3.5.0-23-generic x86_64
# OS: Ubuntu 12.10 quantal
### KERNEL PARAMETER ###
$ grep vendor /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"
### SCRIPT ###
#!/usr/bin/env sh
# /etc/pm/sleep.d/99toshiba
if [ $1 == suspend ]
then
cat /sys/class/backlight/intel_backlight/brightness >
/var/run/brightness
elif [ $1 == resume ]
then
echo 3 > /sys/class/backlight/toshiba/brightness
cat /var/run/brightness >
/sys/class/backlight/intel_backlight/brightness
fi
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https://bugs.launchpad.net/bugs/935778
Title:
Various Toshiba laptops - brightness controls work on first boot, but
do nothing after suspend/resume to RAM.
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