Re: radeonfb: DDC read wrong?

[Luca <kronos@people.it>]

Il Tue, Jun 27, 2006 at 04:55:49AM +0800, Antonino A. Daplas ha scritto: 
> Robert Siemer wrote:
> > On Sun, Jun 25, 2006 at 08:00:30AM +0800, Antonino A. Daplas wrote:
> >> Robert Siemer wrote:
> >>> On Sat, Jun 24, 2006 at 08:11:46PM +0800, Antonino A. Daplas wrote:
> >>>> Robert Siemer wrote:
> >> Disregard the previous patch, I forgot to adjust the checksum.
> >> Try this instead...
> > 
> > The patch works in the way that I see a console without a video= param.
> > 
> > Please answer my questions:
> > -Does the EDID block that reads the kernel get somehow exported or
> >  used somewhere else (in kernel maybe)?
> 
> For drivers that use the EDID, it gets converted into struct fb_monspecs.
> Part of this structure is a private mode database
> (cat /sys/class/graphics/fb0/modes).

With radeonfb you can also access the raw edid block(s):
/sys/class/graphics/fb0/device/edid1
/sys/class/graphics/fb0/device/edid2 (for second monitor, if any).

> > -Which mode gets choosen from the resulting set of resolutions? I mean,
> >  based on what?
> 
> Depends on the driver. A combination of the 'first detailed timing
> is preferred' flag and a detailed timing is the initial startup mode.
> As for radeonfb, I think it just grabs the first detailed timing for
> the initial mode.

Yes, the selection goes like this:

- mode option
- 1st detailed block
- 1st mode in the db


Luca
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