http://bugzilla.kernel.org/show_bug.cgi?id=11095





------- Comment #6 from [EMAIL PROTECTED]  2008-07-19 01:43 -------
Zhang,

As far as I know the sz61 has 2 bios versions, one for winXP one for Vista.
In the XP version the DSDT exposes the 2 methods uset to set and get the
brightness (SBRT and GBRT).
Unfortunately some extra magic seems to be required as calling those doesn't
produce the expected behaviour. If some willingful user can trace what else is
required I'll be happy to implement it in sony-laptop. (BTW: all my efforts at
tracing acpi and ioport calls in windows regularly resulted in the os dying so
I can't really advise on hoe to do it)

For the Vista version there are no such methods.

honestly, if there was a standars compliant way of changing the brightness on
vaios i'd definitely go for that.

-- mattia


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