The adding of acpi_backlight=vendor into grub boot option FIXED the
problem in my Dell Inspiron 15R. I'm using the 3.11.0-9-generic 64 bits
kernel.
Without the proposed fix, the only way I have found to turn brightness
to MAX was setting the config below as ROOT:
echo 4882 >
/sys/class/backlight/intel_backlight/brightness
(the previous default value of
/sys/class/backlight/intel_backlight/brightness was 574)
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https://bugs.launchpad.net/bugs/1225811
Title:
[Dell Inspiron 15R 5521] Can't toggle backlight brightness
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