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Old 08-10-2007, 02:52 PM   #1
Registered: Sep 2003
Distribution: Slackware
Posts: 626

Rep: Reputation: 38
Analog/Digital connections and Nvidia

I bought my first LCD screen, a Samsung 203b, and was unpleasantly surprised by the ugly fonts (compared to CRT). After some tweaking, mostly from Cathectic's how-to, I got the fonts looking reasonable.

My graphics card (Nvidia 6600gt) has both DVI and D-Sub connections, as has the monitor. I connected both cables.

I discovered that if I use the "nv" driver, the analog mode produces a badly garbled picture (basically rippled colors) and the DVI mode looks great.

Using the "nvidia" driver (v 100.14.11) gives the opposite effect - analog works OK and digital gives a black screen.

The problem:
in DVI (with "nv") the fonts look good, but the graphics performance is weak - eg scrolling pages with lots of images is slow, CPU works hard;
in analog mode (with "nvidia") graphics performance much better, but fonts look ragged and not uniform.

Is there a way to use the nvidia driver in DVI mode?

:relevant xorg.conf details
Section "Monitor"
# for Samsung 203B
    Identifier     "My Monitor"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
    DisplaySize     397 317   # 96 DPI @ 1400x1050
   Option "DPMS" 
   Option "standby time" "15"
   Option "suspend time" "60"
   UseModes     "Modes[0]"

Section "Modes"
    Identifier   "Modes[0]"
    Modeline "1280x960_75.00"  129.86  1280 1368 1504 1728  960 961 964 1002  -HSync +Vsync
    Modeline "1400x1050"  122.61  1400 1488 1640 1880  1050 1051 1054 1087  -HSync +Vsync

Section "Device"
    #VideoRam    4096
    # Insert Clocks lines here if appropriate
    Identifier     "VESA Framebuffer"
    Driver         "nv"
   Option   "UseEdidDpi" "FALSE"
   Option   "DPI" "96"

Section "Screen"
   Identifier     "Screen 1"
    Device         "VESA Framebuffer"
    Monitor        "My Monitor"
    DefaultDepth    24
            Depth       24
        Modes     "1400x1050" "1280x1024" "1024x768" "800x600" "640x480"
        #Modes     "1280x1024" "1024x768" "800x600" "640x480"
        #Modes      "1280x960"
Old 08-11-2007, 10:39 AM   #2
Registered: Sep 2003
Distribution: Slackware
Posts: 626

Original Poster
Rep: Reputation: 38

After much internet searching and trial and error, I have it working well enough.

Adding the line
Option "ConnectedMonitor" "DFP"
to the monitor section allows me to use the nvidia driver in DVI mode. Analog mode won't work in this situation, but if I need it, I just comment out the "ConnectedMonitor" line and I have analog with nvidia driver.

Hope this helps somebody else.


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