I've found this workaround for the Samsung n210 netbook:

1. Add this to GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub:
"quiet splash acpi_backlight=vendor intel_idle.max_cstate=0"
2. update-grub
3. update-initramfs -u

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https://bugs.launchpad.net/bugs/150086

Title:
  gnome-power-manager brightness control is crazy

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