Re: Some questions

[Sven Luther <luther@dpt-info.u-strasbg.fr>]

On Thu, Mar 06, 2003 at 06:51:58PM +0800, Antonino Daplas wrote:
> On Thu, 2003-03-06 at 18:48, Antonino Daplas wrote:
> > On Thu, 2003-03-06 at 18:31, Sven Luther wrote:
> > > On Thu, Mar 06, 2003 at 06:05:37PM +0800, Antonino Daplas wrote:
> > > > Yes, there is.  Using the "stale" pixelclock, htotal and vtotal,
> > > > calculate hsync and vsync.  Compare this with your monitor's limit -- if
> > > > any fall outside, the entire mode, pixelclock and all is not valid.
> > > > 
> > > > (see fb_get_mode() and fb_validate_mode() in fbmon.c)
> > > > 
> > > > And if you use very narrow vsync and hsync ranges, then the "stale"
> > > > pixelclock will always most certainly be invalid.
> > > 
> > > BTW, do we have an easy way of knowing if it is an LCD or analog monitor
> > > which is attached to the card (or even a TV) ? I think the radeonfb
> > > knows how to do this, not sure though.
> > > 
> > 
> > There's an EDID parser in fbmon.c.  I think it will work only for the
> > PPC. This is currently used by rivafb and radeonfb. For the rest, either

Mmm, is it because the EDID parser uses the EDID information pased by
the OF ?

> > we implement DDC or just have something similar to XF86Config's
> > HorizSync and VertRefresh.  We can load this either as a kernel/module
> > option or passed via ioctl/sysfs.  

Most monitors today have DDC support, so i guess best would be to use
it, and fall back to a command line option if DDC is not supported.

> > I'm already doing this with the i810fb (as boot/module option), which
> > greatly simplified mode switching.
> 
> Oops, totally missed your question :-)  But yes, I think the EDID block
> contains information about the monitor type, not sure thogh.

X finds :

Digital Display Input

So, i guess this is it.

Friendly,

Sven Luther


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