Workaround: changing GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub by
adding 'acpi_osi="Linux" acpi_backlight=vendor'

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="Linux"
acpi_backlight=vendor"

then sudo update-grub && reboot

------
asus 1001p

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LCD brightness not correct on Asus Eee 1005
https://bugs.launchpad.net/bugs/546494
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