nV News Forums - Apple Cinema 30" an strange lines

I use the dual-DVI connector to hook a Quadro FX 4500 to the Apple 30" display @ 2560 x 1600 50Hz. I'm running RHEL 4 and using the 9746 drivers. In this confirguration (and with previous drivers) whenever pixels (in this case the depth buffer as luminance) are drawn to the screen using glDrawPixels, I get these tile lines (see below). The same code on the same machine (or others) with smaller displays does not produce lines.

The modeline for the monitor looks like this

Code:

Section "Monitor"

    Identifier     "Apple30"

    DisplaySize     640    400

    HorizSync       49.0 - 98.0

    VertRefresh     60.0

    Gamma           1.6

    ModeLine       "2560x1600" 268.0 2560 2608 2640 2720 1600 1603 1609 1646

    Option         "DPMS"

EndSection

...

Section "Screen"

    Identifier     "Screen0"

    Device         "Device0"

    Monitor        "Apple30"

    DefaultDepth    24

    Option         "Overlay" "True"

    Option         "CIOverlay" "True"

    Option         "Stereo" "0"

    Option         "SLI" "Off"

    SubSection     "Display"

        Depth       24

        Modes      "2560x1600" "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"

    EndSubSection

EndSection

Bug?