It may be the same as this issue reported upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=202513
** Bug watch added: Linux Kernel Bug Tracker #202513
https://bugzilla.kernel.org/show_bug.cgi?id=202513
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After I user "acpi_backlight=vendor", Brightness is 3 steps.
** Attachment added: "brightness_3step"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924736/+files/brightness_3step
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I reinstall my OS, I can adjust brightness befor I user
"acpi_backlight=vendor".
** Attachment added: "brightness_problem"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924735/+files/brightness_problem
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I have same problem on my Dell Latitude 3540 with Ubuntu 13.10.
** Attachment added: "report"
https://bugs.launchpad.net/dell-sputnik/+bug/954661/+attachment/3923676/+files/report
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I have the same issue in Ubuntu 12.04.3. My laptop is Dell Latitude
3540.
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https://bugs.launchpad.net/bugs/1069357
Title:
[Dell Vostro V131] Hardware keys change backlight
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