@Eduardo and @J. Shaw -

Sorry for the regression...

1. Does booting with the kernel parameter "acpi_backlight=vendor" fix
it?  (see the PPA instructions page)

2. Please post or email me the output from: $ ls /sys/class/backlight

Thanks,  -Kamal

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558

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