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I have Ubuntu 12.04 LTS 32bit in my Dell Latitude E5530 with Intel core i5 and graphics of Intel® Ivybridge Mobile x86/MMX/SSE2.

I can change Brightness with Fn buttons but screen brightness reset to maximum after every reboot. There is no Brightness control in Brightness & Lock menu.

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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Why isn't there the Brightness slider in menu?

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