xf86-video-ati-6.7.195 - don't load my customized video mode - and seems to work only with the buggy DDC video modes.

wallak at free.fr wallak at free.fr
Thu Oct 25 09:47:17 PDT 2007

I agree with the fact that in a multi-head configuration we may want to assign
each monitor with a different configuration. But, Xorg allows sophistication in
screen and monitor handling. The "Screen" Section allows to set the default
video mode, and a set of secondary modes, that enable to change the resolution
dynamically with Ctrl+Alt++ and Ctrl+Alt+-, this works well with one monitor,
and allows to zoom, and read tiny font engine, or to use resolution like
720x576 for a perfect rendering of videos on an analog screen, with the right
vertical frequency and without the need of a rescaler that add artefacts and
lower the output quality.

The new syntax seems to remove the "Screen" section, and so remove most of the
sophistication. I hope that the goal is not to follow a poorly minded OS, but to
improve everything. It is advisable to allows to handle a flat panel screen, and
classical analog screen (that allows a perfect rendering whatever the
resolution, or the
vertical frequency is). In my opinion for that goal to be reached, it is
advisable to add
a "Screen" section per monitor, and / or, an other Screen section to handle
special case,
like an S-Video output. And to extend the Ctrl+Alt++ function for other outputs
with a command line option. It will allows to use the same syntax to set an
S-Video display to 50 or 60Hz .
And in that case the association of "Screen" sections and outputs may be done in
the "ServerLayout" section.

J. Wallak

Quoting Alex Deucher <alexdeucher at gmail.com>:

> On 10/25/07, wallak at free.fr <wallak at free.fr> wrote:
> > Best Regards,
> >
> > 'Option          "Monitor-DVI-1" "Compaq-15xxS"' assigns my monitor to the
> > device. Nevertheless the problems goes on. The "Screen" section which
> define the
> > default video mode, seems to be bypassed, and the 'xrandr enabled driver'
> takes
> > the largest video mode as default. Everything looks like a blind plug and
> play
> > behavior. Xrand is not well documented, and seems to prevent the usage of
> > customized mode, or buggy monitors. In my opinion an option to disable it,
> is
> > probably the right thing to do. Otherwise, do you know a method to get the
> > classical, and fully configurable,  xorg behavior with an xrandr enabled
> driver
> > ?
> You can do the same things, you just have to do them differently as a
> screen can have more than one monitor associated with it.  These
> options are documented in the xorg.conf man pages and on this page:
> http://www.intellinuxgraphics.com/dualhead.html.  The old config model
> doesn't support the new driver model.  The old config model assumes
> one monitor per screen.  If you have 3 different monitors attached,
> and you specify a set of modes in the screen section of your config,
> which monitors do you want those modes to apply to? All of them? One
> of them?  Two of them?  And if you specify a mode, what rate and
> timings to you want it to use? 1024x768 at 72 @85 @60? reduced blanking?
> Once you've associated a monitor section with an output you can add
> you custom modes and if you want to use a custom one as your default
> mode, specify it using the PreferredMode option:
> Option "PreferredMode"  "mymode"
> You can also change modes and add new modes at runtime using xrandr.
> run xrandr --help to see the options.  To add new modes, take a look
> at xrandr --newmode and xrandr --addmode.
> the radeon ignore edid option is currently broken, but I haven't
> decided on the best fix yet.
> Alex
> >
> > Best Regards,
> >
> >
> >
> > Quoting Alex Deucher <alexdeucher at gmail.com>:
> >
> > > On 10/23/07, wallak at free.fr <wallak at free.fr> wrote:
> > > > Here is my test configuration, and the logs. Without the NoDDC option,
> X11
> > > > start, but with the modes given only by the DDC.
> > >
> > > > Option          "Monitor-VGA-0" "Compaq-15xxS"
> > >
> > > Your card has two DVI ports so there is not VGA-0 output.  assign the
> > > monitor to DVI-0 or DVI-1 depending on which port the monitor is
> > > plugged into.
> > >
> > > Option          "Monitor-DVI-1" "Compaq-15xxS"
> > > or
> > > Option          "Monitor-DVI-0" "Compaq-15xxS"
> > >
> > > You might also try swapping ports as it looks like your monitor does
> > > not provide an edid.
> > >
> > > Alex
> > >
> >
> >
> >

More information about the xorg mailing list