Hi! > > Certainly "linear" (this device will work more or less correctly if the > > userspace applies perceptual curves). Not sure about logarithmic since > > what is actually useful is something that is "perceptually linear" > > (logarithmic is merely a way to approximate that). > > > > I do wonder about a compatible string like most-detailed to > > least-detailed description. This for a PWM with the auto-generated > > tables we'd see something like: > > > > cie-1991,perceptual,non-linear > > > > For something that is non-linear but we are not sure what its tables are > > we can offer just "non-linear". > > Thanks for the feedback! > > It seems clear that we want a string for the added flexibility. I can > work on a patch with the compatible string like description you > suggested and we can discuss in the review if we want to go with that > or prefer something else.
Compatible-like string seems overly complicated.
> > Instead one valid value for the sysfs should be "unknown" and this be
> > the default for drivers we have not analysed (this also makes it easy to
> > introduce change here).
>
> An "unknown" value sounds good, it allows userspace to just do what it
> did/would hace done before this attribute existed.
What about simply not presenting the attribute when we don't have the
information?
Pavel
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