I found this issue is fixed in Linux kernel.
Please see
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6dda730e55f412a6dfb181cae6784822ba463847.
** Changed in: unity-settings-daemon
Status: Incomplete => Invalid
** Changed in: gnome-desktop3 (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1340544
Title:
gnome-rr: Normalize the minimum brightness level.
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