Jumpy mouse on 27" imac when using 2nd monitor

Exactly as my post suggests, I'm using an acer AL2016 20" monitor via a mini displayport to DVI adaptor at 1680x1050. What's weird is it isn't always jumpy, just sometimes. But only when the second monitor is connected does this happen.
I've tried this with 2 different logitech trackballs and few different mice, it makes it hard to click on anything because the mouse "jumps"... the speed it moves isn't consistent. I've tried cleaning the trackball, even replacing it. Only thing I can think is the difference in resolution between the two monitors(2560x1440 vs 1680x1050) is confusing it.
Message was edited by: MNMinstrel

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# Copyright 2004 The X.Org Foundation
# Permission is hereby granted, free of charge, to any person obtaining a
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# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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# Option "XkbVariant" ""
# Option "XkbOptions" ""
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# the following line.
# Option "Protocol" "Xqueue"
# Mouse-speed setting for PS/2 mouse.
# Option "Resolution" "256"
# Baudrate and SampleRate are only for some Logitech mice. In
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# Mouse wheel mapping. Default is to map vertical wheel to buttons 4 & 5,
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# Option "Emulate3Timeout" "50"
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# Option "ChordMiddle"
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# When using XQUEUE, comment out the above two lines, and uncomment
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# HorizSync may be a comma separated list of discrete values, or a
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# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
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# HorizSync 30-64 # multisync
# HorizSync 31.5, 35.2 # multiple fixed sync frequencies
# HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
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# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
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Identifier "My Monitor"
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VertRefresh 50.0 - 70.0
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Section "Monitor"
Identifier "aticonfig-Monitor[0]"
Option    "VendorName" "ATI Proprietary Driver"
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# The chipset line is optional in most cases. It can be used to override
# the driver's chipset detection, and should not normally be specified.
# Chipset "generic"
# 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
# indicates which driver should interpret the information in this section.
# The BusID line is used to specify which of possibly multiple devices
# this section is intended for. When this line isn't present, a device
# section can only match up with the primary video device. For PCI
# devices a line like the following could be used. This line should not
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# BusID "PCI:0:10:0"
# VideoRam 256
# Clocks 25.2 28.3
Identifier "Standard VGA"
Driver "vga"
VendorName "Unknown"
BoardName "Unknown"
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# Insert Clocks lines here if appropriate
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Driver "vesa"
EndSection
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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"
Viewport 0 0
Depth 8
Modes "1280x800" "800x600" "640x480"
EndSubSection
SubSection "Display"
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"
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# Edit this file with caution, and see the xorg.conf(5) manual page.
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# 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
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FontPath "/usr/share/fonts/X11/75dpi/:unscaled"
FontPath "/usr/share/fonts/X11/Type1"
FontPath "/usr/share/fonts/X11/100dpi"
FontPath "/usr/share/fonts/X11/75dpi"
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Load "dri"
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Option "Emulate3Buttons" "true"
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Identifier "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
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Xrandr 1.2 provides means for this. But today the only supported configuration is xorg-server-1.3 + xf86-video-intel-2.0. So for Radeon you'll have to wait for drivers that support Randr 1.2.
On my laptop (Thinkpad x60s) that would be:
xrandr --output VGA --auto
xrandr --output LVDS --off

Arrange option missing when a 2nd monitor is connected

I connected a 2nd monitor to my 1.9 pre-Intel iMac g5 but I can only mirror my destop. When go under Display preferences, I am not given the option to arrange the displays.
What am I missing?
~reicko

That is how Apple designed those iMacs. The Intel-based iMacs were the first iMacs to allow extended desktop.
However you may want to take a look at Macworld's "Screen Spanning iMac" article.
Message was edited by: Duane

I am stumped I do not understand why my roommates macbook pro when duel screened will display perfectly on my monitor while mine refuses to, but mine will display perfectly when using another monitor that is not mine. Please help me out.

One day when using my duel display the second monitor decided it wouldn't display at full resolution in the middle of doing something i was confused. I use a mini display to hdmi then hdmi to the second monitor. I thought maybe the converter or cable died. I bought another another mini display to hdmi and tried another hdmi cord and the same issue. My roommate has macbook pro as well so i decided to see if it was the monitor, when i pluged the mini display converter into his and used the external monitor it displayed perfectly not below resolution. Doing this I knew it was not the monitor or the mini display to hdmi or the hdmi cable. I took it into the genuis bar assuming now that it was my grapics card or logic board. When the genuis went to duel screen it on a cinema display it displayed perfectly. So went home tried to duel screen it again and still not displaying at full resolution. That is where I am stuck, in summary:
My screen used to display perfect resolution on a second monitor and suddenly did not.
Tested two mini display to hdmi and hdmi cords both were fine.
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Apparently you have tried everything except - take the monitor in question to the Apple Store along with your computer. If it works there, the mystery continues.

Imac not recognizing 2nd monitor

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~john theaker
windsor ontario canada
iMac 2.8gz quad core 17
Samsung monitor
mini

Hi John,
I really have no idea, but as a test, hold alt key at cold startup, let it set on that screen for maybe a minute or two, then click the startup volume or hit enter... any change?
Also, if you log out & back in does it show up?

Desktop acting weird when using External Monitor.

Hey guys,
Just wondering if people have been having this weird "problem" when using an external monitor on OS X Mavericks. Though not really an issue that makes the OS/Mac usable, it's more of a quality of life thing (and it's really annoying for someone who likes things to be where I put them).
Anyways, the problem is that when I use my external monitor when at home, I have it set as the main display while the monitor on my MacBook Pro 15" acts as the extended/secondary monitor. No problems in functionality, BUT, the icons on my desktop always move while my external monitor is in use.
I usually do my work while using my external monitor and I use my desktop as my initial location to save my work files before moving them to an appropriate folder. However, revert back to not using the external monitor, everything just gets muddled up on top of eachother, stuff (sometimes) get missplaced and it just becomes a hassle to rearrange my desktop to how it was before.
tl:dr: desktop icons move when I use my external monitor as my main display.
So does anyone know if this is a problem that can be fixed, or is it an issue my monitor being a 3rd party model and old?
(Monitor HP w2448h — http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay?ac .admitted=1391518927628.876444892.199480143&javax.portlet.begCacheTok=com.vignet te.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.pr p_ba847bafb2a2d782fcbb0710b053ce01=wsrp-navigationalState%3DdocId%253Demr_na-c01 482166-8%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.tpst=ba847bafb2a2d78 2fcbb0710b053ce01&sp4ts.oid=3454237)

Hi BradnBeaverton,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Whether or not you are using an Apple Cinema Display, the behaviour you are describing is the same:
Apple Cinema Display: Troubleshooting steps
http://support.apple.com/kb/HT2810
Desktop icons move after screen resolution change
Changing the screen resolution affects the display of information on your screen, especially changing to a smaller resolution. The operating system may automatically reposition icons after you change the screen resolution.
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/HT5369
Cheers,
- Judy

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When I connect my MacBook Pro to an external LCD screen and also connect my soundoutput to an external amplifier I get noise in the speakers. What can I do to avoid this?
It gets even worse when using powercord on my MacBook.

this is caused by processor noise/power interference. one fix is to turn the volume all the way up on the macbook pro,and adjust volume on the amplifier.

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