Hi Elliot, CRT monitors have a coil (which when powered up creates a strong magnetic field) around the edge of the tube to degauss them. The tubes also produce interesting magnetic fields when they are in operation. If they are placed too close together this can interfere with the operation of each of them -10cm is far too close. Try 30-40cm apart and it should solve the problem. If you need them to be close then get a couple of LCD monitors (17" about $190 each or so) which don't have this characteristic.
Heracles elliott-brennan wrote: > Hi Ben, > > Thanks for the suggestions. > > The monitor screens are about 10cms apart and the rear about 30cm (they > sit at a slight angle to each other on the desktop). > > There are no other power cables crossing the video cables. Each of the > monitors is plugged into a separate power point. > > My original post was a little misleading. I do not get a flickering of > the monitors in synch or consecutively when opening mail. I meant it > occurs whether I open mail when the Thunderbird mail application is open > in either monitor. > > I'll keep experimenting though. > > I'm wondering too whether it is generally the case that the second > monitor in such set-ups works less well than the primary??? > > Regards, > > Patrick > > Ben Donohue wrote: >> Hi, >> I've had similar to this before... >> sometimes it power. You might try to plug them into the power in a >> different way. >> Ben >> >> >> elliott-brennan wrote: >>> Hi all, >>> >>> I'm wondering if anyone has any suggestions or advice? >>> >>> I'm running Kubuntu 6.06 on a Hyperthreaded 3Ghz P4 with 1.5G RAM. >>> >>> I have to 17" Philips monitors (107T5 - primary - and a 107S6 - >>> secondary) running off a 128Mb Nvidia FX5500 dual-head card. >>> >>> At times (e.g.. when I open mail from Thunderbird) I get a slight >>> flicker on the second monitor and similar on the primary monitor. >>> >>> I've tried various refresh frequencies, but to no avail. >>> >>> I've posted (below) my xorg.conf in case anyone has any suggestions >>> or can see something that I can't (highly likely :)). >>> >>> NB. I modified xorg.conf to show only 1024x768 as dual-display it >>> wouldn't play nice otherwise. >>> >>> Thanks for any assistance or advice offered. >>> >>> >>> Regards, >>> >>> Patrick >>> **************** >>> # /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 "Files" >>> FontPath "/usr/share/X11/fonts/misc" >>> FontPath "/usr/share/X11/fonts/cyrillic" >>> FontPath "/usr/share/X11/fonts/100dpi/:unscaled" >>> FontPath "/usr/share/X11/fonts/75dpi/:unscaled" >>> FontPath "/usr/share/X11/fonts/Type1" >>> FontPath "/usr/share/X11/fonts/100dpi" >>> FontPath "/usr/share/X11/fonts/75dpi" >>> # path to defoma fonts >>> FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType" >>> EndSection >>> >>> Section "Module" >>> Load "bitmap" >>> Load "ddc" >>> Load "extmod" >>> Load "freetype" >>> Load "int10" >>> Load "record" >>> Load "type1" >>> Load "vbe" >>> load "glx" >>> load "v4l" >>> EndSection >>> >>> Section "InputDevice" >>> Identifier "Generic Keyboard" >>> Driver "kbd" >>> option "CoreKeyboard" >>> option "XkbRules" "xorg" >>> option "XkbModel" "pc104" >>> option "XkbLayout" "us" >>> 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" >>> Driver "wacom" >>> Identifier "stylus" >>> option "Device" "/dev/wacom"# Change to >>> option "Type" "stylus" >>> option "ForceDevice" "ISDV4"# Tablet PC ONLY >>> # /dev/input/event >>> # for USB >>> EndSection >>> >>> Section "InputDevice" >>> Driver "wacom" >>> Identifier "eraser" >>> option "Device" "/dev/wacom"# Change to >>> option "Type" "eraser" >>> option "ForceDevice" "ISDV4"# Tablet PC ONLY >>> # /dev/input/event >>> # for USB >>> EndSection >>> >>> Section "InputDevice" >>> Driver "wacom" >>> Identifier "cursor" >>> option "Device" "/dev/wacom"# Change to >>> option "Type" "cursor" >>> option "ForceDevice" "ISDV4"# Tablet PC ONLY >>> # /dev/input/event >>> # for USB >>> EndSection >>> >>> Section "Device" >>> identifier "Intel Corporation 82865G Integrated Graphics Controller" >>> boardname "NVIDIA GeForce FX (generic)" >>> busid "PCI:1:2:0" >>> driver "nvidia" >>> screen 0 >>> vendorname "NVIDIA" >>> EndSection >>> >>> Section "Monitor" >>> identifier "PHILIPS 107T" >>> vendorname "Philips" >>> modelname "Philips 107S(17inch/CM1300)" >>> HorizSync 30.0-69.0 >>> VertRefresh 50.0-120.0 >>> modeline "[EMAIL PROTECTED]" 94.5 1024 1072 1168 1376 768 769 772 808 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 78.8 1024 1040 1136 1312 768 769 772 800 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 75.0 1024 1048 1184 1328 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 65.0 1024 1048 1184 1344 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 44.9 1024 1032 1208 1264 768 768 776 817 >>> +hsync interlace +vsync >>> gamma 1.0 >>> EndSection >>> >>> Section "Screen" >>> Identifier "Default Screen" >>> Device "Intel Corporation 82865G Integrated Graphics Controller" >>> Monitor "PHILIPS 107T" >>> DefaultDepth 24 >>> SubSection "Display" >>> depth 24 >>> modes "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> EndSubSection >>> EndSection >>> >>> Section "ServerLayout" >>> Identifier "Default Layout" >>> screen 0 "Default Screen" 0 0 >>> screen 1 "screen2" rightof "Default Screen" >>> InputDevice "Generic Keyboard" >>> InputDevice "Configured Mouse" >>> InputDevice "stylus" "SendCoreEvents" >>> InputDevice "cursor" "SendCoreEvents" >>> InputDevice "eraser" "SendCoreEvents" >>> EndSection >>> >>> Section "DRI" >>> Mode 0666 >>> EndSection >>> Section "device" # >>> identifier "device1" >>> boardname "Intel 865" >>> busid "PCI:0:2:0" >>> driver "i810" >>> screen 0 >>> vendorname "Intel" >>> EndSection >>> Section "screen" # >>> identifier "screen1" >>> device "device1" >>> defaultdepth 24 >>> monitor "monitor1" >>> SubSection "Display" >>> depth 24 >>> modes "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> EndSubSection >>> EndSection >>> Section "monitor" # >>> identifier "monitor1" >>> vendorname "Plug 'n' Play" >>> modelname "Plug 'n' Play" >>> modeline "[EMAIL PROTECTED]" 94.5 1024 1072 1168 1376 768 769 772 808 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 78.8 1024 1040 1136 1312 768 769 772 800 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 75.0 1024 1048 1184 1328 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 65.0 1024 1048 1184 1344 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 44.9 1024 1032 1208 1264 768 768 776 817 >>> +hsync interlace +vsync >>> gamma 1.0 >>> EndSection >>> Section "device" # >>> identifier "device2" >>> boardname "NVIDIA GeForce FX (generic)" >>> busid "PCI:1:2:0" >>> driver "nvidia" >>> screen 1 >>> vendorname "NVIDIA" >>> EndSection >>> Section "screen" # >>> identifier "screen2" >>> device "device2" >>> defaultdepth 24 >>> monitor "monitor2" >>> SubSection "Display" >>> depth 24 >>> modes "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> "[EMAIL PROTECTED]" >>> EndSubSection >>> EndSection >>> Section "monitor" # >>> identifier "monitor2" >>> vendorname "Philips" >>> modelname "Philips 107S(17inch/CM1300)" >>> HorizSync 30.0-69.0 >>> VertRefresh 50.0-120.0 >>> modeline "[EMAIL PROTECTED]" 94.5 1024 1072 1168 1376 768 769 772 808 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 78.8 1024 1040 1136 1312 768 769 772 800 >>> +hsync +vsync >>> modeline "[EMAIL PROTECTED]" 75.0 1024 1048 1184 1328 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 65.0 1024 1048 1184 1344 768 771 777 806 >>> -vsync -hsync >>> modeline "[EMAIL PROTECTED]" 44.9 1024 1032 1208 1264 768 768 776 817 >>> +hsync interlace +vsync >>> gamma 1.0 >>> EndSection >>> Section "ServerFlags" >>> option "Xinerama" "true" >>> EndSection >>> >>> >>> ***************** >>> >>> >>> >>> >>> >> >> >> > -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
