I don't know why you would get that error. Can you modprobe acpi-call
and run:

c(){ echo "$1" | sudo tee /proc/acpi/call >/dev/null && sudo cat
/proc/acpi/call;echo;}

c '\ASLB'
c '\_SB_.PCI0.GFX0.CAL1'

Please post the output of the last two commands (the first command just defines 
a helper function).
For me, the first one outputs 0xb378f018. In my DSDT, CAL1 is named "CADL" 
(though CALn with 2 <= n <= 8 has the same name as yours) and shows 0x100.

On my laptop, the CADL (CAD1) field appears as: /proc/iomem:
b376f000-b379efff : ACPI Non-volatile Storage

Note that these initial scripts have been tested on an Oneiric machine
(I cannot remember whether this was with the xorg-edgers/ppa repository
enabled or not), later tests have been done on a vanilla kernel from
kernel.org with a custom config.

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https://bugs.launchpad.net/bugs/806032

Title:
  Fn + F[89] does not work for controlling brightness on Clevo laptops
  (B7130, W150HRM)

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