Hi,
 
I am getting black vertical lines across the top 2/3rd of my display at the resolution of 1024x768 and I don't know how to correct the problem.
 
The X -probeonly command generates the following output:

XFree86 Version 4.0.3 / X Window System
(protocol Version 11, revision 0, vendor release 6400)
Release Date: 16 March 2001
 If the server is older than 6-12 months, or if your card is
 newer than the above date, look for a newer version before
 reporting problems.  (See http://www.XFree86.Org/FAQ)
Operating System: Linux 2.2.17-8smp i686 [ELF]
Module Loader present
(==) Log file: "/var/log/XFree86.0.log", Time: Sun Mar 24 13:00:05 2002
(==) Using config file: "/etc/X11/XF86Config-4"
Markers: (--) probed, (**) from config file, (==) default setting,
         (++) from command line, (!!) notice, (II) informational,
         (WW) warning, (EE) error, (??) unknown.
(==) ServerLayout "XFree86 Configured"
(**) |-->Screen "Screen0" (0)
(**) |   |-->Monitor "ViewSonic 17EA"
(**) |   |-->Device "ATI Mach64"
(**) |-->Input Device "Mouse0"
(**) |-->Input Device "Keyboard0"
(**) XKB: layout: "us"
(**) FontPath set to "unix/:7100"
(==) RgbPath set to "/usr/X11R6/lib/X11/rgb"
(==) ModulePath set to "/usr/X11R6/lib/modules"
(--) using VT number 7
 
(II) Loading /usr/X11R6/lib/modules/fonts/libbitmap.a
(II) Module bitmap: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/libpcidata.a
(II) Module pcidata: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 0.1.0
(II) Loading /usr/X11R6/lib/modules/libscanpci.a
(II) Module scanpci: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 0.1.0
(II) Unloading /usr/X11R6/lib/modules/libscanpci.a
(--) PCI:*(0:12:0) ATI Mach64 GX rev 3, Mem @ 0xfa000000/24
(II) Loading /usr/X11R6/lib/modules/extensions/libdbe.a
(II) Module dbe: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/extensions/libGLcore.a
(II) Module GLcore: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/extensions/libdri.a
(II) Module dri: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/linux/libdrm.a
(II) Module drm: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/extensions/libglx.a
(II) Module glx: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/extensions/libextmod.a
(II) Module extmod: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/drivers/linux/v4l_drv.o
(II) Module v4l: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 0.0.1
(II) Loading /usr/X11R6/lib/modules/drivers/ati_drv.o
(II) Module ati: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 6.2.3
(II) Loading /usr/X11R6/lib/modules/input/mouse_drv.o
(II) Module mouse: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) v4l driver for Video4Linux
(II) ATI: ATI driver (version 6.2.3) for chipsets: ati, ativga
(II) R128: Driver for ATI Rage 128 chipsets: ATI Rage 128 RE (PCI),
 ATI Rage 128 RF (AGP), ATI Rage 128 RG (AGP), ATI Rage 128 RK (PCI),
 ATI Rage 128 RL (AGP), ATI Rage 128 Pro PD (AGP),
 ATI Rage 128 Pro PF (AGP), ATI Rage 128 Mobility LE (PCI),
 ATI Rage 128 Mobility LF (AGP), ATI Rage 128 Mobility MF (AGP),
 ATI Rage 128 Mobility ML (AGP)
(II) RADEON: Driver for ATI Radeon chipsets: ATI Radeon QD (AGP),
 ATI Radeon QE (AGP), ATI Radeon QF (AGP), ATI Radeon QG (AGP)
(II) Loading /usr/X11R6/lib/modules/drivers/atimisc_drv.o
(II) Module ati: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 6.2.3
(==) ATI(0): Chipset:  "ati".
(**) ATI(0): Depth 8, (--) framebuffer bpp 8
(II) Loading /usr/X11R6/lib/modules/linux/libint10.a
(II) Module int10: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) ATI(0): Primary V_BIOS segment is: 0xc000
(II) Loading /usr/X11R6/lib/modules/libddc.a
(II) Module ddc: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/libvbe.a
(II) Module vbe: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) ATI(0): VESA BIOS detected
(--) ATI(0): ATI 88800GX-F graphics controller detected.
(--) ATI(0): Chip type 4758 "GX", class 0, revision 0x03.
(--) ATI(0): PCI bus interface detected;  sparse I/O base is 0x02EC.
(--) ATI(0): VGA Wonder registers at I/O port 0x01CE.
(--) ATI(0): ATI Mach64 adapter detected.
(--) ATI(0): ATI 68860 (Revision C) or similar RAMDAC detected.
(==) ATI(0): RGB weight 666
(==) ATI(0): Default visual is PseudoColor
(==) ATI(0): Using gamma correction (1.0, 1.0, 1.0)
(II) ATI(0): Using Mach64 accelerator CRTC.
(II) ATI(0): Using 4 MB linear aperture at 0xFA000000.
(II) ATI(0): Using Block 0 MMIO aperture at 0xFA3FFC00.
(II) ATI(0): MMIO write caching enabled.
(--) ATI(0): 2048 kB of Enhanced VRAM (256Kx4, x8, x16) detected.
(WW) ATI(0): Cannot shadow an accelerated frame buffer.
(--) ATI(0): ATI 18818 or ICS 2595 or similar programmable clock generator detected.
(--) ATI(0): Reference clock 157.5/11 (14.318) MHz.
(II) ATI(0): ViewSonic 17EA: Using hsync range of 30.00-69.00 kHz
(II) ATI(0): ViewSonic 17EA: Using vrefresh range of 50.00-120.00 Hz
(II) ATI(0): Clock range:   9.00 to  80.00 MHz
(WW) ATI(0): Default mode "1024x768" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1152x864" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1280x960" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1280x960" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1280x1024" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1280x1024" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1280x1024" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1400x1050" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1400x1050" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1400x1050" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1400x1050" deleted (bad mode clock/interlace/doublescan)
(WW) ATI(0): Default mode "1600x1200" deleted (horizontal timing out of range)
(WW) ATI(0): Default mode "1600x1200" deleted (horizontal timing out of range)
(WW) ATI(0): Default mode "1600x1200" deleted (horizontal timing out of range)
(WW) ATI(0): Default mode "1600x1200" deleted (horizontal timing out of range)
(WW) ATI(0): Default mode "1600x1200" deleted (horizontal timing out of range)
(WW) ATI(0): Default mode "1792x1344" deleted (insufficient memory for mode)
(WW) ATI(0): Default mode "1792x1344" deleted (insufficient memory for mode)
(WW) ATI(0): Default mode "1856x1392" deleted (insufficient memory for mode)
(WW) ATI(0): Default mode "1856x1392" deleted (insufficient memory for mode)
(WW) ATI(0): Default mode "1920x1440" deleted (insufficient memory for mode)
(WW) ATI(0): Default mode "1920x1440" deleted (insufficient memory for mode)
(--) ATI(0): Virtual size is 1024x768 (pitch 1024)
(**) ATI(0): Default mode "1024x768": 78.8 MHz, 60.1 kHz, 75.1 Hz
(**) ATI(0): Default mode "800x600": 56.3 MHz, 53.7 kHz, 85.1 Hz
(**) ATI(0): Default mode "640x480": 36.0 MHz, 43.3 kHz, 85.0 Hz
(==) ATI(0): DPI set to (75, 75)
(II) Loading /usr/X11R6/lib/modules/libxaa.a
(II) Module xaa: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/libcfb.a
(II) Module cfb: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
(II) Loading /usr/X11R6/lib/modules/libmfb.a
(II) Module mfb: vendor="The XFree86 Project"
 compiled for 4.0.3, module version = 1.0.0
 
----------------------------------------------------------------------------------------
My XF86Config file has the following contents:
 
# File generated by XConfigurator.
 
# **********************************************************************
# Refer to the XF86Config(4/5) man page for details about the format of
# this file.
# **********************************************************************
 
# **********************************************************************
# Files section.  This allows default font and rgb paths to be set
# **********************************************************************
 
Section "Files"
 
# The location of the RGB database.  Note, this is the name of the
# file minus the extension (like ".txt" or ".db").  There is normally
# no need to change the default.
 
    RgbPath "/usr/X11R6/lib/X11/rgb"
 
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
 
    FontPath   "unix/:7100"
 
EndSection
 
# **********************************************************************
# Server flags section.
# **********************************************************************
 
Section "ServerFlags"
 
    # Uncomment this to cause a core dump at the spot where a signal is
    # received.  This may leave the console in an unusable state, but may
    # provide a better stack trace in the core dump to aid in debugging
    #NoTrapSignals
 
    # Uncomment this to disable the <Crtl><Alt><BS> server abort sequence
    # This allows clients to receive this key event.
    #DontZap
 
    # Uncomment this to disable the <Crtl><Alt><KP_+>/<KP_-> mode switching
    # sequences.  This allows clients to receive these key events.
    #DontZoom
 
EndSection
 
# **********************************************************************
# Input devices
# **********************************************************************
 
# **********************************************************************
# Keyboard section
# **********************************************************************
 
Section "Keyboard"
 
    Protocol    "Standard"
 
    # when using XQUEUE, comment out the above line, and uncomment the
    # following line
    #Protocol   "Xqueue"
 
    AutoRepeat  500 5
 
    # Let the server do the NumLock processing.  This should only be
    # required when using pre-R6 clients
    #ServerNumLock
 
    # Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
    #Xleds      1 2 3
 
    #To set the LeftAlt to Meta, RightAlt key to ModeShift,
    #RightCtl key to Compose, and ScrollLock key to ModeLock:
 
    LeftAlt        Meta
    RightAlt        Meta
   ScrollLock      Compose
   RightCtl        Control
 
# To disable the XKEYBOARD extension, uncomment XkbDisable.
 
#    XkbDisable
 
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults).  For example, for a non-U.S.
# keyboard, you will probably want to use:
#    XkbModel    "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
#    XkbModel    "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
#    XkbLayout   "de"
# or:
#    XkbLayout   "de"
#    XkbVariant  "nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
#    XkbOptions  "ctrl:swapcaps"
 
# These are the default XKB settings for XFree86
#    XkbRules    "xfree86"
#    XkbModel    "pc101"
#    XkbLayout   "us"
#    XkbVariant  ""
#    XkbOptions  ""
 
   XkbKeycodes     "xfree86"
   XkbTypes        "default"
   XkbCompat       "default"
   XkbSymbols      "us(pc101)"
   XkbGeometry     "pc"
   XkbRules        "xfree86"
    XkbModel        "pc101"
    XkbLayout       "us"
EndSection
 
# **********************************************************************
# Pointer section
# **********************************************************************
 
Section "Pointer"
    Protocol    "IntelliMouse"
    Device      "/dev/mouse"
 
# When using XQUEUE, comment out the above two lines, and uncomment
# the following line.
 
#    Protocol "Xqueue"
 
# Baudrate and SampleRate are only for some Logitech mice
 
#    BaudRate 9600
#    SampleRate 150
 
# Emulate3Buttons is an option for 2-button Microsoft mice
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
 
    Emulate3Buttons
    Emulate3Timeout    50
 
# ChordMiddle is an option for some 3-button Logitech mice
 
#    ChordMiddle
 
EndSection
 

# **********************************************************************
# Monitor section
# **********************************************************************
 
# Any number of monitor sections may be present
 
Section "Monitor"
 
    Identifier  "ViewSonic 17EA"
    VendorName  "Unknown"
    ModelName   "Unknown"
 
# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
 
    HorizSync   30-69
 
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
 
    VertRefresh 50-120
 
# Modes can be specified in two formats.  A compact one-line format, or
# a multi-line format.
 
# These two are equivalent
 
#    ModeLine "1024x768i" 45 1024 1048 1208 1264 768 776 784 817 Interlace
 
#    Mode "1024x768i"
#        DotClock 45
#        HTimings 1024 1048 1208 1264
#        VTimings 768 776 784 817
#        Flags  "Interlace"
#    EndMode
 
# This is a set of standard mode timings. Modes that are out of monitor spec
# are automatically deleted by the server (provided the HorizSync and
# VertRefresh lines are correct), so there's no immediate need to
# delete mode timings (unless particular mode timings don't work on your
# monitor). With these modes, the best standard mode that your monitor
# and video card can support for a given resolution is automatically
# used.
 
# 512x384 @ 78 Hz, 31.50 kHz hsync
#Modeline "512x384"    20.160 512  528  592  640   384  385  388  404 -HSync -VSync
# 512x384 @ 85 Hz, 34.38 kHz hsync
#Modeline "512x384"    22     512  528  592  640   384  385  388  404 -HSync -VSync
 
# 640x400 @ 70 Hz, 31.5 kHz hsync
#Modeline "640x400"     25.175 640  664  760  800   400  409  411  450
# 640x400 @ 85 Hz, 37.86 kHz hsync
#Modeline "640x400"     31.5   640  672 736   832   400  401  404  445 -HSync +VSync
 
# 640x480 @ 100 Hz, 53.01 kHz hsync
#Modeline "640x480"     45.8   640  672  768  864   480  488  494  530 -HSync -VSync
# 640x480 @ 60 Hz, 31.5 kHz hsync
#Modeline "640x480"     25.175 640  664  760  800   480  491  493  525
# 640x480 @ 72 Hz, 36.5 kHz hsync
#Modeline "640x480"     31.5   640  680  720  864   480  488  491  521
# 640x480 @ 75 Hz, 37.50 kHz hsync
#ModeLine  "640x480"    31.5   640  656  720  840   480  481  484  500 -HSync -VSync
# 640x480 @ 85 Hz, 43.27 kHz hsync
#Modeline "640x480"     36     640  696  752  832   480  481  484  509 -HSync -VSync
# 640x480 @ 85 Hz, 42.98 kHz hsync (XFree86 Modeline Generator)
#Modeline "640x480"     36.11  640  672  808  840   480  489  496  509
 
# 800x600 @ 100 Hz, 64.02 kHz hsync
#Modeline  "800x600"    69.65  800  864  928 1088   600  604  610  640 -HSync -VSync
# 800x600 @ 56 Hz, 35.15 kHz hsync
#ModeLine "800x600"     36     800  824  896 1024   600  601  603  625
# 800x600 @ 60 Hz, 37.8 kHz hsync
#Modeline "800x600"     40     800  840  968 1056   600  601  605  628 +hsync +vsync
# 800x600 @ 72 Hz, 48.0 kHz hsync
#Modeline "800x600"     50     800  856  976 1040   600  637  643  666 +hsync +vsync
# 800x600 @ 85 Hz, 55.84 kHz hsync
#Modeline  "800x600"    60.75  800  864  928 1088   600  616  621  657 -HSync -VSync
# 800x600 @ 85 Hz, 53.97 kHz hsync (XFree86 Modeline Generator)
Modeline  "800x600"    58.29  800  832 1048 1080   600  611  620  631
 
# 1024x480 for certain Vaios
#Modeline "1024x480"   65 1024 1032 1176 1344 480 491 493 525 -HSync -VSync
# 1024x768 @ 100Hz, 80.21 kHz hsync
#Modeline "1024x768"   115.5  1024 1056 1248 1440  768  771  781  802 -HSync -VSync
# 1024x768 @ 60 Hz, 48.4 kHz hsync
#Modeline "1024x768"    65    1024 1032 1176 1344   768  771  777  806 -hsync -vsync
# 1024x768 @ 70 Hz, 56.5 kHz hsync
#Modeline "1024x768"    75    1024 1048 1184 1328   768  771  777  806 -hsync -vsync
# 1024x768 @ 76 Hz, 62.5 kHz hsync
#Modeline "1024x768"    85    1024 1032 1152 1360   768  784  787  823
# 1024x768 @ 75 Hz, 60.84 kHz hsync (XFree86 Modeline Generator)
Modeline "1024x768"    85.67 1024 1056 1376 1408   768  782  792  807
# 1024x768 @ 85 Hz, 70.24 kHz hsync
#Modeline "1024x768"   98.9  1024 1056 1216 1408   768 782 788 822 -HSync -VSync
 
# 1152x864 @ 100 Hz, 89.62 kHz hsync
#Modeline "1152x864"   137.65 1152 1184 1312 1536   864  866  885  902 -HSync -VSync
# 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  908
# 1152x864 @ 84 Hz, 76.0 kHz hsync
#Modeline "1152x864"   135    1152 1464 1592 1776   864  864  876  908
 
# 1280x960 @ 60 Hz
#Modeline "1280x960"   108   1280 1376 1488 1800 960 961 964 1000 +HSync +VSync
# 1280x960 @ 85 Hz
#Modeline "1280x960"   148.5 1280 1344 1504 1728 960 961 964 1011  +HSync +VSync
 
# 1280x1024 @ 100 Hz, 107.16 kHz hsync
#Modeline "1280x1024"  181.75 1280 1312 1440 1696  1024 1031 1046 1072 -HSync -VSync
# 1280x1024 @ 61 Hz, 64.2 kHz hsync
#Modeline "1280x1024"  110    1280 1328 1512 1712  1024 1025 1028 1054
# 1280x1024 @ 70 Hz, 74.59 kHz hsync
Modeline "1280x1024"  126.5 1280 1312 1472 1696  1024 1032 1040 1068 -HSync -VSync
# 1280x1024 @ 74 Hz, 78.85 kHz hsync
#Modeline "1280x1024"  135    1280 1312 1456 1712  1024 1027 1030 1064
# 1280x1024 @ 76 Hz, 81.13 kHz hsync
#Modeline "1280x1024"  135    1280 1312 1416 1664  1024 1027 1030 1064
# 1280x1024 @ 85 Hz, 91.15 kHz hsync
#Modeline "1280x1024"  157.5  1280 1344 1504 1728  1024 1025 1028 1072 +HSync +VSync
 
# 1400x1050 @ 60Hz, 65.8 kHz hsync
#Modeline "1400x1050"  129   1400 1464 1656 1960 1050 1051 1054 1100 +HSync +VSync
# 1400x1050 @ 70Hz, 76.8 kHz hsync
#Modeline "1400x1050"  151   1400 1464 1656 1960 1050 1051 1054 1100 +HSync +VSync
# 1400x1050 @ 75Hz, 82.3 kHz hsync
#Modeline "1400x1050"  162   1400 1464 1656 1960 1050 1051 1054 1100 +HSync +VSync
# 1400x1050 @ 85Hz, 93.2 kHz hsync
#Modeline "1400x1050"  184   1400 1464 1656 1960 1050 1051 1054 1100 +HSync +VSync
 
# 1600x1200 @ 60Hz, 75.00 kHz hsync
#Modeline "1600x1200"  162   1600 1664 1856 2160  1200 1201 1204 1250 +HSync +VSync
# 1600x1200 @ 70 Hz, 87.50 kHz hsync
#Modeline "1600x1200"  189    1600 1664 1856 2160  1200 1201 1204 1250 -HSync -VSync
# 1600x1200 @ 75 Hz, 93.75 kHz hsync
#Modeline "1600x1200"  202.5  1600 1664 1856 2160  1200 1201 1204 1250 +HSync +VSync
# 1600x1200 @ 85 Hz, 105.77 kHz hsync
#Modeline "1600x1200"  220    1600 1616 1808 2080  1200 1204 1207 1244 +HSync +VSync
 
# 1800x1440 @ 64Hz, 96.15 kHz hsync
#ModeLine "1800X1440"  230    1800 1896 2088 2392 1440 1441 1444 1490 +HSync +VSync
# 1800x1440 @ 70Hz, 104.52 kHz hsync
#ModeLine "1800X1440"  250    1800 1896 2088 2392 1440 1441 1444 1490 +HSync +VSync
 
# Low-res Doublescan modes
# If your chipset does not support doublescan, you get a 'squashed'
# resolution like 320x400.
 
# 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio
#Modeline "320x200"     12.588 320  336  384  400   200  204  205  225 Doublescan
# 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio
#Modeline "320x240"     12.588 320  336  384  400   240  245  246  262 Doublescan
# 320x240 @ 72 Hz, 36.5 kHz hsync
#Modeline "320x240"     15.750 320  336  384  400   240  244  246  262 Doublescan
# 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio
#ModeLine "400x300"     18     400  416  448  512   300  301  302  312 Doublescan
# 400x300 @ 60 Hz, 37.8 kHz hsync
#Modeline "400x300"     20     400  416  480  528   300  301  303  314 Doublescan
# 400x300 @ 72 Hz, 48.0 kHz hsync
#Modeline "400x300"     25     400  424  488  520   300  319  322  333 Doublescan
# 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio
#ModeLine "480x300"     21.656 480  496  536  616   300  301  302  312 Doublescan
# 480x300 @ 60 Hz, 37.8 kHz hsync
#Modeline "480x300"     23.890 480  496  576  632   300  301  303  314 Doublescan
# 480x300 @ 63 Hz, 39.6 kHz hsync
#Modeline "480x300"     25     480  496  576  632   300  301  303  314 Doublescan
# 480x300 @ 72 Hz, 48.0 kHz hsync
#Modeline "480x300"     29.952 480  504  584  624   300  319  322  333 Doublescan
 
EndSection
 

# **********************************************************************
# Graphics device section
# **********************************************************************
 
# Any number of graphics device sections may be present
 
Section "Device"
    Identifier        "Generic VGA"
    VendorName        "Unknown"
    BoardName "Unknown"
    Chipset   "generic"
 
#    VideoRam 256
 
#    Clocks   25.2 28.3
 
EndSection
 
# Device configured by Xconfigurator:
 
Section "Device"
    Identifier  "ATI Mach64"
    VendorName  "Unknown"
    BoardName   "Unknown"
    #VideoRam    2048
EndSection
 

# **********************************************************************
# Screen sections
# **********************************************************************
 
# The Colour SVGA server
 
Section "Screen"
    Driver      "svga"
    Device      "Generic VGA"
    #Device      "ATI Mach64"
    Monitor     "ViewSonic 17EA"
    Subsection "Display"
        Depth       8
        #Modes       "1024x768" "800x600" "640x480"
        ViewPort    0 0
    EndSubsection
EndSection
 
# The 16-color VGA server
 
Section "Screen"
    Driver      "vga16"
    Device      "Generic VGA"
    Monitor     "ViewSonic 17EA"
    Subsection "Display"
        Modes       "640x480" "800x600"
        ViewPort    0 0
    EndSubsection
EndSection
 
# The Mono server
 
Section "Screen"
    Driver      "vga2"
    Device      "Generic VGA"
    Monitor     "ViewSonic 17EA"
    Subsection "Display"
        Modes       "640x480" "800x600"
        ViewPort    0 0
    EndSubsection
EndSection
 
# The accelerated servers (S3, Mach32, Mach8, 8514, P9000, AGX, W32, Mach64
# I128, and S3V)
Section "Screen"
    Driver      "accel"
    Device      "ATI Mach64"
    Monitor     "ViewSonic 17EA"
    DefaultColorDepth   8
    Subsection "Display"
        Depth       8
        Modes       "1024x768" "800x600" "640x480"
        ViewPort    0 0
    EndSubsection
EndSection
 
----------------------------------------------------------------------------------------------
 
My XConfig86-4 file has the following contents:
 
# XFree86 4.0 configuration generated by Xconfigurator
 
Section "ServerLayout"
 Identifier "XFree86 Configured"
 Screen      0  "Screen0" 0 0
 InputDevice    "Mouse0" "CorePointer"
 InputDevice    "Keyboard0" "CoreKeyboard"
EndSection
 
# By default, Red Hat Linux 6.0 and later use xfs
 
Section "Files"
 FontPath "unix/:7100"
EndSection
 
# Module loading section
 
Section "Module"
 Load  "dbe"  # Double-buffering
 Load  "GLcore"  # OpenGL support
 Load  "dri"  # Direct rendering infrastructure
 Load  "glx"  # OpenGL X protocol interface
 Load  "extmod"  # Misc. required extensions
 Load  "v4l"  # Video4Linux
 # Load  "pex5"  # PHIGS for X 3D environment (obsolete)
 # Load  "record" # X event recorder
 # Load  "xie"  # X Image Extension (obsolete)
 # You only need the following two modules if you do not use xfs.
 # Load  "freetype"  # TrueType font handler
 # Load  "type1"  # Adobe Type 1 font handler
EndSection
 
Section "InputDevice"
 Identifier  "Keyboard0"
 Driver      "keyboard"
 Option      "XkbLayout" "us"
EndSection
 
Section "InputDevice"
 Identifier  "Mouse0"
 Driver      "mouse"
 Option      "Device" "/dev/mouse"
 Option      "Protocol" "IntelliMouse"
 Option      "Emulate3Buttons" "on"
 Option      "ZAxisMapping" "4 5"
EndSection
 
Section "Monitor"
 Identifier "ViewSonic 17EA"
 VendorName "Unknown"
 ModelName  "Unknown"
 HorizSync 30-69
 VertRefresh 50-120
 Option "dpms"
EndSection
 
Section "Device"
 Identifier "ATI Mach64"
 Driver "ati"
 BoardName "Unknown"
EndSection
 
Section "Device"
 Identifier "Linux Frame Buffer"
 Driver "fbdev"
 BoardName "Unknown"
EndSection
 
Section "Screen"
 Identifier "Screen0"
 Device "ATI Mach64"
 Monitor "ViewSonic 17EA"
 DefaultDepth 8
 Subsection "Display"
  Depth 8
  Modes "1024x768" "800x600" "640x480"
 EndSubSection
EndSection
 
Section "DRI"
 Mode 0666
EndSection
As indicated in the XF86Config file, I have tried using modelines generated for the XFree86 Modeline Generator for resolution, refresh rate and horizontal sync combinations supported by my monitor as indicated by the X -probeonly output just in the vertical black bar problem I am having is related to a synchronization mismatch between my graphics card and my monitor. I know that the graphics card/monitor combination works properly under Windows 98.
 
Does anyone know the nature of my problem and how to go about solving it?
 
Regards,
 

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