DVI connection problem

[myzelf]

I'm trying to use a Chaintech Geforce 4 Ti4200 128 MB with a Samsung SyncMaster 181T digital flat panel under Mandrake Linux 9.0. I installed official NVIDIA driver 3123 after rebuilding the RPMs and plugged both VGA and DVI monitor cables.

Analogue connection works great, but when I force digital connection using Option ConnectedMonitor "DFP" in XFree config I obtain a blank screen (X is loaded, but the monitor turns off). Killing X I have my console back again.

I noticed that even using Option ConnectedMonitor "CRT" monitor goes blank (and I need to reboot to get something on my monitor).

I tried disabling DPMS and enabling a TwinView configuration but nothing seems to work.

Here's attached my XFree log file trying Option ConnectedMonitor "DFP".

Thanks for your help.

[TriangleMan]

I have the same problem with the Dell 2000FP.
I noticed that the ConnectedMonitor Option with DFP
works IF you have the monitor connected to the DVI output, and
before you start X. After you start X, if you then connect, it is
not working, but if you start emacs on the display (remotely), and exit it, then some glXinit call is made, which starts it back up.

Does anybody from nvidia understand this problem?

Chris

[myzelf]

Option ConnectedMonitor "DFP" doesn't work for me even if DVI is plugged. My monitor has two separate cable (plain VGA and DVI) and I plugged both to video card, but only analog connection seems to work.

[TriangleMan]

For the nvidia engineer,

I have just talked to someone on the phone, who said you woudl be reading this. Here is my problem, which is somewhat related to the original posters.

I have an 8 node system, that runs through a KVM switch.
All the displays are DELL 2000FP (flat panels).

If they are all directly connected at X initialization (without KVM) then all is good. If I run through the KVM, I get trouble starting X. The answer seems to be to use the connected monitor option. The only available options are DFP, CRT and TV.

If I use DFP, then it INSISTS on running through the DVI connection, which is fine, for the moment. If the monitor is connected, it syncs correctly. If the monitor is not connected at Xinit, but connected later, then it does not work, even with the ConnectedMonitor option set.

I CAN though, send a X session command, like "emacs" which upon killing it, resends a glXinit command, which makes the monitor come up.

There seems to be no way to cleanly do this. Do you have any suggestions? The other guy can't even get that to work, so DFP must have some assumed parameters associated with it.

I also have a post on cards burning up, on the nvidia hardware thread, if you are the right person to look at this.

Thanks,

TM

[aritger]

TriangleMan:

The possible values for the ConnectedMonitor option is misleading... they should really have been "VGA" and "DVI"). A digital flatpanel that is plugged into a VGA port appears to the driver like a regular CRT.

To correctly (and safely) program a digital flatpanel, the NVIDIA driver must receive an EDID from the panel. Obviously if the digital flatpanel is not connected, then the driver cannot get an EDID. One solution we've looked into is to provide a mechanism for users to feed an EDID to the driver (eg through a kernel module option or an XF86Config option). This is a good feature request, and we'll look into providing this functionality for a future driver release.

I'm not sure what you mean by "a glXinit command", but it sounds like you're closing the only X client, which causes the X server to start a new server generation. This would cause the NVIDIA X driver to go through its initialization again. That would make sense that that works.

You might also try doing a mode switch (ie ctrl-alt-+/-), rather than killing the current X server generation.

If you're having problems with cards burning up, I'd recommend you contact your video card vendor.

[ikke]

Hi,

I've follewed the the post you left on my thread. There was some usefulle info that inspired me to try some silly actions. (Which solved my problems I presume)
Read my story here: http://www.nvnews.net/vbulletin/showthread.php?s=&postid=35898#post35898