Quadro FX 5500 set resolution

[langkalle]

This i probably the correct forum for my question....:)
The card is Quadro FX 55000 and the connected device (projector) native resolution is 1400x1050.
The only mode in xorg.conf is "1400x1050", but the resolution I get is 1600x1200....?

The Xorg.0.log says:
Validated modes "1400x1050"
Virtual screen size determined to be 1400x1050
(II) NVIDIA(0): Setting mode "1400x1050"
BUT in nvidia-settings, under section DFP-1 it says:
Native Resolution 1600x1200
Best Fit Resolution 1600x1200
FrontEnd Resolution 1400x1050
BackEnd Resolution 1600x1200

What is FrontEnd/BackEnd resolution?
How do I change the settings so I get 1400x1050?

[mkaushik]

Here's what this stuff means, from my understanding. Hope it helps:

Frontend Resolution

This is the current resolution of the image in pixels. When you change the resolution/refresh rate from the control panel, this is what you're changing.

Backend Resolution

The Backend Resolution is the resolution that the GPU is driving to the DFP. If this is different from the Frontend Resolution, the GPU will scale the image from the Frontend Resolution to the Backend Resolution. If you disable GPU scaling, the image will be sent out at the Frontend Resolution itself (i.e., Backend Resolution = Frontend Resolution), and it will be upto the DFP's scaler (if the DFP has one) to scale the image it gets from the GPU to its Native Resolution. In other words, if the Backend Resolution is different from the Native Resolution of the DFP, then the DFP will scale the image from the Backend Resolution to the Native Resolution. In the information provided by some of the newer DFPs via their on-screen-displays, the refresh-rate you see belongs to the Backend Resolution.

Native Resolution

The Native Resolution is the width and height in pixels that the flat panel uses to display the image. All other resolutions must be scaled to this resolution by the GPU and/or the DFP's built in scaler. If the scaling is being done only by the the GPU's scaler, it implies that the image being sent to the DFP is at the same resolution as the Native Resolution (i.e.Backend Resolution = Native Resolution)

Best Fit Resolution

The DFP exposes a number of supported Modes in it's EDID, i.e., a list of resolutions and refresh rates it supports (which it can scale internally to its Native Resolution). The Best Fit Resolution is the Mode, out of the DFP's supported modes in the EDID, that is closest to the Frontend Resolution.

(lee63)