IChat screensharing won't fully connect with dual-monitor setup

I've read through several threads but none seem to match the peculiar problem I am having.
My mum just got a new "13 MacBook Air and an external LG LED (E2240T) monitor. I ran software update on it so her system is current, as is mine (late 2009 MBP/24" ACD).
Screensharing works fine when her external monitor is not connected but when it is plugged in and we try to screenshare the audio connection is established but sharing won't fully load and stops with this:
We tried unplugging the monitor and then plugging it in once the screensharing connection was established and that ended up with the image on my end freezing.
Anybody else have a similar problem? Any suggestions?
For what it's worth with her old (2006) MBP and old LG LCD we had no problems.

Hi,
I have an old 17" Studio Display (The one with the ADC connector) and a 19" CRT Screen that I have On sometimes with my G4/1Ghz Dual Processor.
This is running Snow Leopard.
If I share Screens using iChat with my MacBook Pro, the MacBook Pro puts the Screens Side by side as one picture (You cannot view just one screen).
iChat has a Software "Camera" that deals with the "Desktop" or what ever is on it as the pic for the Screen Sharing feed.
I have tried several Resolution settings on the CRT and iChat seems to cope (They are in a fairly narrow band though).
It might be possible that iChat is having difficulty if the two screens are vastly different in Size or resolution settings.
You seem to be describing using a 13" screen and the 21'5" one which may explain it.
There may also be differences in the Ratio.
3:48 PM Sunday; January 30, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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Here's my hardware:
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Samsung SyncMaster 941BW: 1440x900 (digital)
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InputDevice "Keyboard1" "CoreKeyboard"
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EndSubSection
SubSection "Display"
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Thanks for your help guys, I'm halfway there.
The second monitor shows the KDE desktop, but it isn't exactly what I expected. Right now, both monitors display at 1024x768 (each) or 2048x768 (total). The larger monitor stretches and distorts the display of 1024x768 to its natural resolution at 1440x900 and it isn't what I wanted. Other than that, the dual desktop setup behaves what I expected to.
Here's a snippet of my xorg.conf that currently works:
Section "Monitor"
Identifier "NEC LCD1530V"
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VertRefresh 50.0 - 70.0
EndSection
Section "Monitor"
Identifier "Samsung SyncMaster"
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Section "Device"
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# Insert Clocks lines here if appropriate
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EndSection
Section "Screen"
Identifier "Screen 1"
Device "NVIDIA GeForce"
Monitor "NEC LCD1530V"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 8
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen 2"
Device "NVIDIA GeForce"
Monitor "Samsung SyncMaster"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 8
Modes "1440x900"
EndSubSection
EndSection
Anyone have an idea?
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The Hatter,
I am a novice at Mac so I read all I can. From what I understand the NEC monitors I bought require Display Port for their maximum performance. The GTX 680 only has DVI outputs. Difference from what I understand is larger bandwidth with the DP.
You said I have the 4000 for CUDA. I am not all that familiar with CUDA and when I do read about it I do not understand it.
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So far the 5870 seems the best choice, higher band width than the 5770, and it has 2 Display Ports to optimize the NEC monitors.
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Dual monitor setup with seperate resolutions

hey guys!
i currentley run thye latest version of archlinux with the cinnamon desktop environment and an nvidia geforce 7300SE graphics card.
im running a dual monitor setup with one 27" 1920x1080 monitor and one 27" 1024X768 monitor
because they have the same physical size they line up perfectley but because the resolution is different programs/mouse cursor movement doesnt, is there any way (without changing the resolutions) to compensate this effect so that in the eyes of linux/cinnamon the monitors line up so that for example dragging a window goes seamlessley between the 2 monitors.
i HAVE found out the panning option in the nvidia x server settings, but that really isnt what i am looking for...
Last edited by RikSolo (2014-08-04 11:25:02)

A magnifier following the window down to the pixel, zooming to the exact size of 540 pixels the 384 pixels window could create an illusion of just that. It would be highly impractical however, not mention all the hacking time. Even if you would manage to get two screen with different sized icons, so that they match visually, the windows and fonts resizing on the fly, wmctrl might help with windows alone, no their themes (buttons, borders thickness etc.), you would still be left with a visually differently sized mouse cursor. Technically such a feat should be possible, but who is going to code it? Nvidia?
Last edited by emeres (2014-08-04 18:48:59)

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Moreover, the two monitors can have completely different characteristics. As always, you really need to calibrate/profile any monitor (with a hardware tool - Spyder, Colormunki etc). That's no more important with two monitors, but you see for sure if you don't, as two dissimilar monitors will then probably look different.

Is a dual monitor setup with 2graphic cards possible?

HI.
What i want to do is run Archlinux on my Desktop but i dont want to miss my second monitor.
I could use both monitor on my nvidia graphiccard but i want to use the energy saving features too (wich dont work with 2monitor on one card) therefore my windows setup is big monitor on nvidia and the smaller one on the intel onboard card.
They both get recognized by lspci but only the onboard cards isy being used (the onboard card is the first card on windows too).
So is it possible to get it to work? Id really want to use ARchlinux on my Desktop too but i dont want to use it with one screen or without energy saving?
Working compositing is a must, i want to use gnome3 wich is the only reason to swich to linux for the Desktop (arch is running on the laptop for ages^^) but i dont need to, Win7 is working flawlessly fine and i didnt have to pay for it (msdnaa).
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hy do you need to clock down your card?
Most gpu have a function that clocks down the card@idle and or desktop.
In my case thats down from 850mhz(560ti)to 200mhz while using windows and 50mhz if the gpu load is low.
Thats about 20watts less then with full clock.
The problem is, that the gpu wont clock down with 2monitors on it, it stays at 850mhz.
Theres some driver tweaks for amd cards wich "fix" thatfix this (i believe its intentionl, 2monitors equals more load but its no problem with new cards...
Thats one reason i use my onboard gpu for the second monitor, it works well with windows and also means that swiching off fullscreen (games) to the desktop works a lot better, the second monitor can play a movie while playing wich doesnt work with one gpu and fullscreen.
I really dont need that with Linux since i use it for work and multimedia only but the energy saving feature is nice if the pc is on 8hours and more wich is often the case.
Can you tell which one do you run? I'm going to buy one for dual-monitor setup, and I'm looking for something that will work for shure.
As said dual monitor on one gpu works, amd can do 3monitors while nvidia can do 2 at once, that means if u intend to use 3monitors some day with ur card u have to buy an amd card.
i took the nvidia because is can use it to render videos with cuda support (its not working with all tools yet but its getting better and if it works its a lot faster then my cpu rendering).
PS: Thats one hread about the power saviing with 2monitors:http://forums.nvidia.com/index.php?showtopic=197557
since my monitors dont share the same resolution it seems that theres no way to make it work .
Last edited by halfzware (2011-05-12 21:17:41)

IChat screensharing won't fully connect with dual-monitor setup

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