Bug#198447: G450 Dual-Head: Second Monitor I2C Detection Happening Incorrectly

[Marc Wilson <msw@cox.net>]

On Thu, Jun 26, 2003 at 01:01:36AM -0500, Jason Bucata wrote:
> On Tue, Jun 24, 2003 at 09:51:13PM -0700, Marc Wilson wrote:
> > I got around this by explicitly disabling I2C on both heads.  I knew
> > perfectly well what the specifications of my monitors were... I didn't
> > need X to figure it out for me. ^_^
> 
> How do I go about trying that?  I pored over the docs I could find on
> xfree86.org but they didn't say anything about how to do that.

The relevant sections from my archived (and hopefully correct)
configuration file for the G550:

Section "Device"
        Identifier      "MatroxG550 Primary"
        VendorName      "Matrox"
        Driver          "mga"
        Screen          0
        BusID           "PCI:1:0:0"
        Option          "NoDDC"
        Option          "AGPMode"       "2"
EndSection

Section "Device"
        Identifier      "MatroxG550 Secondary"
        VendorName      "Matrox"
        Driver          "mga"
        Screen          1
        BusID           "PCI:1:0:0"
        Option          "NoDDC"
        Option          "AGPMode"       "2"
EndSection

I think the "NoDDC" option is what you want.

Here is some discussion from the Matrox forum via Google's cache regarding
the detection problem (Ben is/was the only one of their moderators that had
a brain):

http://216.239.39.100/search?q=cache:W02FxzA7OjEJ:forum.matrox.com/mgaforum/Forum2/HTML/001921.html+matrox+%22noDDC%22&hl=en&ie=UTF-8&client=googlet

The "NoDDC" option is discussed here:

http://www.xfree86.org/4.0/RELNOTES2.html

-- 
 Marc Wilson |     The disks are getting full; purge a file today.
 msw@cox.net |