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Re: Can't disable DDC?



On Mon, 2008-04-07 at 11:15 +0200, Brad du Plessis wrote: 
> 
> Eric Anholt wrote:
> > On Mon, 2008-02-25 at 13:42 +0200, Brad du Plessis wrote:
> >   
> >> Hi all,
> >>
> >> I've got an Intel-G33 based motherboard (on NetBSD 4 STABLE, modular 
> >> xorg) and I am trying to disable DDC using:
> >>
> >> Option "DDC" "false"
> >>
> >> in the xorg.conf driver setup as suggested by the intel driver man page. 
> >> It doesn't seem to be disabling DDC though, and I'm seeing this in 
> >> Xorg.0.log:
> >>
> >> -- snip --
> >> (II) Loading sub module "ddc"
> >> (II) LoadModule: "ddc"(II) Module already built-in
> >> -- snip --
> >>
> >>
> >> Is this option implemented in this driver (intel 2.1.1) ?
> >>     
> >
> > We really rely on using DDC these days, so the option may be completely
> > broken now.  Can you explain why you're trying to disable it?
> >   
> 
> Another problem I've come across recently with DDC is that I've got 2 
> field systems running through a KVM to a single wide screen monitor. If 
> the system not currently outputting to the active monitor gets rebooted, 
> DDC picks up some weird settings from the KVM (which I assume is 
> emulating a monitor somehow). The result is that the system has to be 
> rebooted again while switched to the monitor. Disabling DDC here would 
> really really help.

xrandr --auto when you've got the KVM switched to that machine would
work around your broken KVM hardware (unless your monitor is bigger than
what the KVM tells you, in which case you may need a Virtual line in
xorg.conf to work around our driver's failure to handle framebuffer
resize).

You can also configure a preferred, potentially custom mode, even with
DDC not being disabled.

-- 
Eric Anholt                             anholt%FreeBSD.org@localhost
eric%anholt.net@localhost                         
eric.anholt%intel.com@localhost

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