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[Hooman Baradaran <599607@xxxxxxxxxxxxxxxxxx>]

Yes. the max could be 0x1ffff.
Here's the info you asked for:

$ cat /sys/class/dmi/id/sys_vendor
Sony Corporation
$ cat /sys/class/dmi/id/product_name
VPCCW21FX

P.S. I've pretty much got things working: I switched back to
nvidia_bl-0.52 and used mix = 4096, max= 131071. The steps act weird and
(according to gnome) it seems to jump the steps, but at least I can turn
the screen a bit darker.

-- 
nvidia-bl-dkms 0.16.10 Blank screen on brightness change
https://bugs.launchpad.net/bugs/599607
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Status in Mactel Support: New

Bug description:
I have a Sony Vaio VPCCW21FX (Nvidia 310M) running Lucid.

After I installed nvidia-bl-dkms 0.16.10, the brightness buttons showed the brightness indicator but it didn't move.
Manually writing values to /sys/class/backlight/nvidia_backlight/brightness turn the backlight completely off (the backlight only turned back on after a suspend/resume).

Then I copied sony brightness scripts from here:

http://ubuntuforums.org/showthread.php?t=1420341

... after that, using the brightness buttons on the laptop turned the screen off as well.