LCD strange symptom

[minixar]

Hey folks!
I've recently bought a Benq LCD 19' FP91G+. I installed it through dvi connection of my Geforce 6500 TC. I use it under GNU/Linux (Ubuntu Distro) and WinXP at a 1280x1024 resolution. I noticed that when full screen white and blue colors get displayed some “movements/waves” in the image get noticed. I don’t know how to explain this phenomenon because it never happened with any CRT monitor.
I tried changing the refresh rate from 60 to 75 with some improvement in the images quality (but still noticeable). According to the monitor manual, 75Hz is the maximal rate allowed. If I change the resolution to 1024x768@70 the problem isn’t noticeable. Is this common with LCD monitors or should I go to RMA?
Thanks a lot for the help!

P.S.: Excuse me for my English!

 

[~LoKe]

If I recall correctly, that monitor is supposed to run at 1280x1024, so that shouldn't be a problem. Can you give me the output of this command in the terminal?
cat /etc/X11/xorg.conf

 

[minixar]

I tried to add a 1280x1024@70 resolution but it's impossible. Thanks a lot for your answer!

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Mon May 15 13:23:42 PDT 2006

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerLayout"
Identifier "Default Layout"
screen 0 "Default Screen" 0 0
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
# InputDevice "stylus" "SendCoreEvents"
# InputDevice "cursor" "SendCoreEvents"
# InputDevice "eraser" "SendCoreEvents"
EndSection

Section "Files"

# path to defoma fonts
FontPath "/usr/share/X11/fonts/misc"
FontPath "/usr/share/X11/fonts/100dpi:unscaled"
FontPath "/usr/share/X11/fonts/75dpi:unscaled"
FontPath "/usr/share/X11/fonts/Type1"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
FontPath "/usr/local/share/fonts"
EndSection

Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "extmod"
Load "freetype"
Load "int10"
Load "type1"
Load "vbe"
load "glx"
load "v4l"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
option "CoreKeyboard"
option "XkbRules" "xorg"
option "XkbModel" "pc105"
option "XkbLayout" "es"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
option "CorePointer"
option "Device" "/dev/input/mice"
option "Protocol" "ExplorerPS/2"
option "ZAxisMapping" "4 5"
option "Emulate3Buttons" "true"
EndSection

#Section "InputDevice"
#
# # /dev/input/event
# # for USB
# Identifier "stylus"
# Driver "wacom"
# Option "Device" "/dev/wacom" # Change to
# Option "Type" "stylus"
# Option "ForceDevice" "ISDV4" # Tablet PC ONLY
#EndSection

#Section "InputDevice"
#
# # /dev/input/event
# # for USB
# Identifier "eraser"
# Driver "wacom"
# Option "Device" "/dev/wacom" # Change to
# Option "Type" "eraser"
# Option "ForceDevice" "ISDV4" # Tablet PC ONLY
#EndSection

#Section "InputDevice"
#
# # /dev/input/event
# # for USB
# Identifier "cursor"
# Driver "wacom"
# Option "Device" "/dev/wacom" # Change to
# Option "Type" "cursor"
# Option "ForceDevice" "ISDV4" # Tablet PC ONLY
#EndSection

Section "Monitor"
identifier "BenQ FP91G+"
modelname "Custom 1"
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "640x480@72" 31.5 640 664 704 832 480 489 491 520 -vsync -hsync
modeline "640x480@75" 31.5 640 656 720 840 480 481 484 500 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
modeline "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "832x624@75" 57.284 832 864 928 1152 624 625 628 667 -vsync -hsync
modeline "1024x768@75" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
modeline "1024x768@70" 75.0 1024 1048 1184 1328 768 771 777 806 -vsync -hsync
modeline "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
modeline "1152x864@75" 108.0 1152 1216 1344 1600 864 865 868 900 +hsync +vsync
modeline "1152x768@54" 64.995 1152 1178 1314 1472 768 771 777 806 +hsync +vsync
modeline "1280x854" 80.0 1280 1309 1460 1636 854 857 864 896 +hsync +vsync
modeline "1280x1024@75" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
modeline "1280x960@60" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync
modeline "1280x1024@60" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
modeline "1280x960@75" 129.86 1280 1368 1504 1728 960 961 964 1002 -hsync +vsync
modeline "1400x1050@60" 122.61 1400 1488 1640 1880 1050 1051 1054 1087 -hsync +vsync
modeline "1600x1200@65" 175.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
modeline "1600x1200@60" 162.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
gamma 1.0
EndSection

Section "Device"
identifier "NVIDIA Corporation NV40 [GeForce 6200?]"
boardname "nv"
busid "PCI:6:0:0"
driver "nvidia"
screen 0
EndSection

Section "Screen"
Identifier "Default Screen"
Device "NVIDIA Corporation NV40 [GeForce 6200?]"
Monitor "BenQ FP91G+"
DefaultDepth 24
SubSection "Display"
depth 24
modes "1280x1024@75"
EndSubSection
EndSection
Section "device" #
identifier "device1"
boardname "nv"
busid "PCI:6:0:0"
driver "nvidia"
screen 1
EndSection
Section "screen" #
identifier "screen1"
device "device1"
defaultdepth 24
monitor "monitor1"
EndSection
Section "monitor" #
identifier "monitor1"
gamma 1.0
EndSection
Section "ServerFlags"
EndSection