Hissing noise in monitors when plugging external lcd
Hi,
this is a bit off topic, but it's logic related in a way ..
When using an external monitor (lcd), as soon as the metal from the monitor plug touches my macbook pro dvi jack, my (audio) monitors produces a hissing noise.
The power bar i'm using is plugged in a wall outlet that has no ground. I assumed the bad grounding was the problem, but making a connection with a metal wire between my macbook and a copper pipe didn't help. I think if the grounding was the reason of the hissing, that should have solved, althought temporarly, my problem...
does that ring a bell to anyone ?
thanks in advance..
Hi jukea and welcome!
Wow, thats a tough one. First, make sure you don't have any audio cables laying on top of your power supplies/AC power in general. Check all audio cables in-line. Some audio monitors may not have adequate RF shielding, so move your monitors away from the display if you can. If this is a permanent setup and the power can not be helped, I would get and ISO box to loop through before I connected my audio monitors.
Maybe:
http://www.jensen-transformers.com/pi2xx.html
Or:
http://www.sweetwater.com/store/detail/IT1/
You would need 2 of those, for stereo inputs.
Good Luck!
delton
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# File generated by xorgconfig.
# Copyright 2004 The X.Org Foundation
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# The X.Org Foundation BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# Except as contained in this notice, the name of The X.Org Foundation shall
# not be used in advertising or otherwise to promote the sale, use or other
# dealings in this Software without prior written authorization from
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# FontPath "/usr/share/fonts/Type1"
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# FontPath "/usr/lib/X11/fonts/misc/"
# FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
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# the following line.
# Option "Protocol" "Xqueue"
# Mouse-speed setting for PS/2 mouse.
# Option "Resolution" "256"
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# Option "SampleRate" "150"
# Mouse wheel mapping. Default is to map vertical wheel to buttons 4 & 5,
# horizontal wheel to buttons 6 & 7. Change if your mouse has more than
# 3 buttons and you need to map the wheel to different button ids to avoid
# conflicts.
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
# Option "Emulate3Buttons"
# Option "Emulate3Timeout" "50"
# ChordMiddle is an option for some 3-button Logitech mice
# Option "ChordMiddle"
Identifier "Mouse1"
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Option "Protocol" "Auto" # Auto detect
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# When using XQUEUE, comment out the above two lines, and uncomment
Option "ZAxisMapping" "4 5 6 7"
# Emulate3Buttons is an option for 2-button mice
EndSection
Section "Monitor"
# 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 30-64 # multisync
# HorizSync 31.5, 35.2 # multiple fixed sync frequencies
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VertRefresh 50.0 - 70.0
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# The chipset line is optional in most cases. It can be used to override
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# The Driver line must be present. When using run-time loadable driver
# modules, this line instructs the server to load the specified driver
# module. Even when not using loadable driver modules, this line
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# VideoRam 256
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BoardName "Unknown"
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Driver "vesa"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
EndSection
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Identifier "Screen 1"
Device "* Generic VESA compatible"
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DefaultDepth 24
SubSection "Display"
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Depth 8
Modes "1280x800" "800x600" "640x480"
EndSubSection
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Viewport 0 0
Depth 16
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Viewport 0 0
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Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
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SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Ubuntu xorg.conf
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# (Type "man 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
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InputDevice "Configured Mouse"
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InputDevice "Synaptics Touchpad"
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Sounds like you need a VGA cable with male VGA plugs at both ends. Quite common, for VGA monitors that don't have hard-wired cables.
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