Re: [PATCH] [RESEND] Add Dell laptop backlight brightness display

[Michael E Brown]

On Mon, 2006-02-20 at 17:53 +0100, Pavel Machek wrote:
> Hi!
> 
> > 	Matthew has shown up on the libsmbios-devel mailing list. I sent
> > all the
> > info needed to do a test of Dell LCD brightness control. The main thing
> > left
> > would be to make one utility out of the current separate, unsupported,
> > test 
> > utils. 
> > 
> > 	As for fixing i8k, I don't have the slightest clue where to
> > begin. You 
> > either have to split initialization with userspace to parse and send in
> > the 
> > correct io/magic ports to do SMI, or you have to put Dell-specific SMI
> > token 
> > parsing in the kernel.
> 
> What is wrong with Dell-specific SMI parsing in kernel? Is it _that_
> much code?
> 

Pavel,
	Sorry for the late response. 

	No, it isn't that much code. You are welcome to rip the parsing from
libsmbios. There are about three or so C structs necessary to parse it.
The total code is probably about 30-40 lines. (see
libraries/token/TokenDA.cpp, and libraries/common/TokenLowLevel.h). 

	My only point is that _everything_ that this module does can now be
completely and fully implemented in userspace using dcdbas and
libsmbios. I'm not against fixing the current i8k code, though. I don't
have the time to submit a patch myself, but would be happy to help any
interested volunteers.
--
Michael

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