How eliminate video artifacts while drawing?

Subject: How eliminate video artifacts while drawing?
From: Dick Benster (ribenster@home.net)
Date: Mon Aug 30 1999 - 00:49:04 MDT

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Hi,

I'm running YDL Champion 1.1 with KDE on a standard 1998 beige
PowerMac
300Mhz G3 Mini Tower e with 6MB on-board SGRAM video memory.
I get lots of transient horizontal white lines while doing graphics, for
instance
simply dragging a window around, although the picture is correct once
the dragging
and drawing is complete. The above system has no such problems when
running
MacOS or MacOSX Server.

Anybody know how to eliminate these? The possibly relevant portions
of /etc/X11/XF86Config file looks like

Section "Monitor"

    Identifier "Sony GDM-400PS/400PST/19PS"
    VendorName "Unknown"
    ModelName "Unknown"

    HorizSync 30.0-95.0
    VertRefresh 48.0-160.0

# 1152x864 @ 89 Hz interlaced, 44 kHz hsync
ModeLine "1152x864" 65 1152 1168 1384 1480 864 865 875 985
Interlace

# 1152x864 @ 60 Hz, 53.5 kHz hsync
Modeline "1152x864" 89.9 1152 1216 1472 1680 864 868 876 892
-HSync -VSync

# 1152x864 @ 70 Hz, 62.4 kHz hsync
Modeline "1152x864" 92 1152 1208 1368 1474 864 865 875 895

# 1152x864 @ 78 Hz, 70.8 kHz hsync
Modeline "1152x864" 110 1152 1240 1324 1552 864 864 876

# 1152x864 @ 84 Hz, 76.0 kHz hsync
Modeline "1152x864" 135 1152 1464 1592 1776 864 864 876 908

# 1152x864 @ 100 Hz, 89.62 kHz hsync
Modeline "1152x864" 137.65 1152 1184 1312 1536 864 866 885 902
-HSync -VSync

Section "Device"
    Identifier "ATY Mach64"
    VendorName "Unknown"
    BoardName "Unknown"
    VideoRam 6144
    # Insert Clocks lines here if appropriate
EndSection

Section "Screen"
    Driver "fbdev"
    Device "ATY Mach64"
    Monitor "Sony GDM-400PS/400PST/19PS"
    Subsection "Display"
        Depth 32
        Modes "1152x864"
        ViewPort 0 0
        Virtual 1152 864
    EndSubsection
EndSection

Thanks for any help!

Dick Benster
La Honda Software

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