[Openchrome-users] Brightness/contrast controls?

[Gonzalo A. de la Vega]

On 5/2/07, Jon Nettleton <jon.nettleton at gmail.com> wrote:
>
> On Tue, 2007-05-01 at 22:56 -0300, Gonzalo A. de la Vega wrote:
> > On 5/1/07, Andrei Formiga <andrei.formiga at gmail.com> wrote:
> >         On 5/1/07, Gonzalo A. de la Vega <gadelavega at gmail.com> wrote:
> >         >
> >         > I'll share my experience FWIW (I'm a telecom engineer, so my
> >         programming
> >         > sucks)
> >         > I had a similar problem with my laptop's display, and I
> >         ended up "hard"
> >         > conding the contrast/brightnes correction into the driver.
> >
> >         That's precisely what I'm thinking about doing, for the time
> >         being. I
> >         can't wait until the right way is in place. Did you do it for
> >         the
> >         openchrome drivers? Any pointers for where I should start
> >         looking to
> >         play with this? Thanks.
> >
> > Here is the patch against the latest svn. This is only for 24bpp, you
> > can easily figure out where to change it for 16bpp if you need so.
> > Note there is no separate brightness/contrast values, but a single
> > factor. Maybe you could use a file to store the multiplying factors
> > (all 0.75 for me), and change those. To update the B/C, you may use
> > xgamma, which calls the function that executes this code.
> >
> >
> >         > I found no
> >         > "comfortable" way of using any X interface to apply a proper
> >         colormap (which
> >         > I believe would be the correct way of doing it), every time
> >         I tried to
> >         > change the colormap, X complained about me trying to write
> >         read only data.
> >         > I understand the solution would be a driver specific thing,
> >         but I don't know
> >         > how to do this without violating all the X programming
> >         rules.
> >         >
>
> The question is, is it worth implementing this into a driver option that
> can be specified in xorg.conf?  Definitely not the right solution but is
> certainly better than hard-coding the driver.  I probably won't commit
> it until I talk to some of the other developers, but I might write up a
> patch you guys can use to specify in xorg.conf.
>
> Jon


I can write the code if want. It may not be elegant, but if it's a valid
solution it may be useful.

Gonzalo
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