Bug#198447: G450 Dual-Head: Second Monitor I2C Detection Happening Incorrectly
retitle 198447 Matrox Dual-Head: Second Monitor DDC Queries Going To First Monitor Instead
tags 198447 upstream
thanks
On Thu, Jun 26, 2003 at 08:28:42PM -0700, Marc Wilson wrote:
> 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.
>
<snip>
> I think the "NoDDC" option is what you want.
That looks like it did the job. I hadn't noticed that this feature is
called "DDC".
I still haven't gotten it working like I would want it to, so I guess
I'd need to play with the modes some more, but then again that's OK
since I'm not desperate to use this particular feature on two mismatched
monitors anyway.
> 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
>
It talks about VBE (VESA BIOS Extensions), so it sounds like a standards
problem. If XFree86 would skip the VESA BIOS (like the Linux kernel
skips the system BIOS) this probably wouldn't be an issue.
Jason B.
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