video flicker, XF86 4.0.2, ATI Mach64

video flicker, XF86 4.0.2, ATI Mach64

Post by Chad Evere » Wed, 28 Mar 2001 09:03:03

I have what I would describe as video flicker (random flashes of
very thin short black lines when displaying a white background)
on my SuSE 7.1 system configured with SaX2.  The flicker is not
present when the ViewSonic A90 monitor is attached to another
system running a different OS with a Matrox Millenium card.

Any suggestions on correcting this flicker problem? Here  is
info on my system/video:

Running XFree86 4.0.2 with:

Generated via SuperProbe command:

First video: Super-VGA
        Chipset: ATI 264GT3 (3D Rage Pro) (Port Probed)
        Memory:  8192 Kbytes
        RAMDAC:  ATI Mach64 integrated 15/16/24/32-bit DAC w/clock
                 (with 6-bit wide lookup tables (or in 6-bit mode))
                 (programmable for 6/8-bit wide lookup tables)
        Attached graphics coprocessor:
                Chipset: ATI Mach64
                Memory:  8192 Kbytes

Pertinent sections of my XF86Config file:

Section "Monitor"
  HorizSync     15-72
  Identifier    "Monitor[0]"
  ModelName     "DDC-Probed"
  VendorName    "DDC-Probed"
  VertRefresh   30-87
  UseModes      "Modes[0]"

Section "Modes"
  Identifier    "Modes[0]"
  Modeline      "1280x1024" 116.48 1280 1296 1552 1736 1024 1024 1034 1070 +hsync +vsync
  Modeline      "1152x870" 97.61 1152 1168 1384 1568 870 870 881 909
  Modeline      "800x600" 46.80 800 816 928 1072 600 600 606 626
  Modeline      "640x480" 29.12 640 656 720 864 480 480 485 501

Section "Screen"
  DefaultDepth  16
  SubSection "Display"
    Depth       15
    Modes       "1280x1024" "1152x870" "800x600" "640x480"
  SubSection "Display"
    Depth       16
    Modes       "1280x1024" "1152x870" "800x600" "640x480"
  SubSection "Display"
    Depth       24
    Modes       "1280x1024" "1152x870" "800x600" "640x480"
  SubSection "Display"
    Depth       32
    Modes       "1280x1024" "1152x870" "800x600" "640x480"
  SubSection "Display"
    Depth       8
    Modes       "1280x1024" "1152x870" "800x600" "640x480"
  Device        "Device[0]"
  Identifier    "Screen[0]"
  Monitor       "Monitor[0]"

Section "Device"
  BoardName     "Rage 3D Pro AGP"
  BusID         "1:0:0"
  Driver        "ati"
  Identifier    "Device[0]"
  Screen        0
  VendorName    "ATI"


1. ATI Mach64 + AcceleratedX + CTX 1765CM = flickers - any advise?

We're using Linux 1.3.34 on Slackware 3.0 on a PC/Pentium-90.

I have one of those ATI Mach64 Graphics adapters with the RAMDAC that
doesn't work with the servers that come with XFREE86.  I've tried the
XInside AcceleratedX software and it works properly except that the
screen is extremely flickery.  I've tried both of the CTX 1765 monitor
settings (1765cm isn't on their list) but to no avail.

Does anyone have any suggestions with this setup on how I might reduce
the screen flicker.  The monitor is capable of 1024x768 at 75Hz which
is what I'd like to use.

Also, I have the PCI version of the Graphics Xpression w/2MB of DRAM.
Does the fact that it's a PCI version make any difference?

Thanks in advance.

  NCAR/ACD Unix Systems Administration

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