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-   -   dual screen problem with GTX280M (http://www.nvnews.net/vbulletin/showthread.php?t=148517)

Thymoglobule 03-03-10 07:55 AM

dual screen problem with GTX280M
Hi, I just recieved a new laptop (Clevo M980NU). The graphic card is a GTX280M (M for mobile edition). I am using windows 7 on this computer. I am trying to use an external screen plugged on the DVI port but I am having troubles.
I downloaded the latest driver from nVIdia today and installed it.

- First I tried a screen that does not have a DVI input, so I had to use a VGA/DVI adaptator. The screen is detected, but the resolution is wrong. The only resolution I can choose for the external display is 1920x1080, which is the resolution of my laptop screen. The actual resolution of the external display is 1440x900 but it is not detected. The picture on the external display is of course completly destroyed with this incorrect resolution (I am actually surprised that something is displayed at all). To make things worse, if I press the "detect" button in the display settings of windows 7, the main display switches to the external screen and the integrated screen of my laptop is not detected anymore...

- Then I tried a screen that has a DVI input, hopping that the problem was linked to the use of a VGA/DVI adaptator. The screen is simply never detected! Just to be sure, I used another screen with a DVI input from my work and the result was the same: not detected!

I'd like to know if someone has experienced the same issues. It would help me determine if it is a software or hardware problem. Thank you in advance.

Jon 03-03-10 01:45 PM

Re: dual screen problem with GTX280M
When you say latest drivers do you mean latest as in beta or latest as in whql? I've found that in some driver versions the dvi out doesn't work at all. Almost like its excluded from beta builds.

Also, I usually just hot plug the monitor into the dvi port... if windows detects it, both screens go black for a couple of seconds before coming back on.

Thymoglobule 03-04-10 05:08 AM

Re: dual screen problem with GTX280M
Thank you for your answer. I am using the WHQL drivers, not something beta. So I did more tests today, searching for a hardware problem and I found it: it was actually the DVI cable I was using that has a bad contact. The cable is brand new, so it was the last thing I checked...
There are still troubles with the resolution when I use a VGA cable with VGA/DVI adaptor to plug a non-DVI screen, but I guess the adapator is preventing the proper detection of the resolution.

Jon 03-04-10 07:45 AM

Re: dual screen problem with GTX280M
My monitor has both dvi and rgb in. If I use dvi->rgb it doesn't detect my monitor at all and after a couple of seconds the monitor goes into power saving mode. But dvi->dvi it works perfectly. Just for reference, I run dual monitors off the M980NU. One is dvi->dvi and the other hdmi->hdmi. At one point I did connect dvi->hdmi but had a strange problem where the desktop was 1920x1080 but didn't fit the screen. But there was a 1:1 pixel mapping option in the monitors menus that sorted it.

Thymoglobule 03-04-10 11:22 AM

Re: dual screen problem with GTX280M
So you mean that I can plug a 3rd screen using the HDMI output? Sounds nice.

Jon 03-04-10 01:40 PM

Re: dual screen problem with GTX280M
Hmmm, not sure. I have 2 external monitors connected just fine. But this disables the laptop screen. I would assume 2 is the max although thats with SLI enabled. So maybe its different with SLI off.

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