Works (kinda) for me with a VGN-B3XP. The sliders under
System>Preferences>Power Management don't work, while the underlying
/sys stuff and hotkeys work fine. See bug 152731 for *that*.
Do you have hotkeys for the brightness? Does pressing them work? What
about:
$ sudo /etc/acpi/sonybright.sh down
$ sudo /etc/acpi/sonybright.sh up
If these don't do the trick, could you attach the output of lspci -vvv
and lsmod?
Note that the /proc file you're thinking of doesn't exist on my fresh
Gutsy system: I have a /sys/class/backlight/sony/ directory instead,
whose brightness entry is the thing to fiddle with as root.
--
Screen Brightness adjustment fails for Sony VAIO VGN-AR250G
https://bugs.launchpad.net/bugs/152095
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