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I've had this issues across multiple machines and multiple versions of Ubuntu desktop (all 10.04 or later). Usually it happens with an old laptop I've put Ubuntu on but now it's happening on my primary dev machine (a quad-core PC recently upgraded to Ubuntu 12.04 desktop). The problem is this - I can connect to the machine and login with the password, the initial screen looks fine but never refreshes. I can see the monitor for the machine across the room and can see the mouse move and the menus pop up but the image of the screen on the PC in front me running the VNC viewer never updates. So the mouse and keyboard commands are working.

  • Ubuntu 12.04 Desktop
  • Ultra VNC Viewer (also seen with RealVNC's free VNC viewer)
  • Desktop Sharing Static IP on eth0; Dynamic ID on eth1

I think it is an Ubuntu config issue because this PC used to work just fine with 9.04, 10.04, and 11.10 (over the past couple of years). I've also had a couple of laptops that used to have this issue with older Ubuntu's but don't with 12.04.

Additional info:

The Win7 PC I'm trying to use to control the Ubuntu PC is connected via 2 DLink 8-port gigabit routers. The Ubuntu laptop I usually control via VNC is typically only connected to the network via wireless. The screen refresh is choppy but usable. I've repeated the issue on a Win7 laptop which was connected via ethernet and wireless.

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Switch to Unity 2D for now There's a fix for 3d, someone will be along shortly. –  izx Jun 26 '12 at 4:53
    
I'm not that big a fan of Unity. If Unity is the the issue can I fix it by installing/using Gnome or one of the other desktops? –  user73279 Jun 26 '12 at 6:04
    
Is this a bug to be filed against Unity or VNC? Bugs are usually closed as off-topic but I'm glad you sorted it out for now. If this is a known bug it is best to flag the question. –  Tom Brossman Jul 2 '12 at 22:13
    
No idea really. Everything works well with the VNC using Unity2D. It worked OK (see the answer below regarding the moving windows to refresh) on my laptop which was running Gnome. Running KDE Plasma did nothing to change the problem. Now I run Unity2D on both the PC and laptop I've mentioned and the only issue appears to be having a VNC screen up to both of them but I haven't thoroughly tested that (other priorities right now). –  user73279 Jul 6 '12 at 19:52
    
possible duplicate of VNC session very slow in 12.04 compared to older versions –  Eliah Kagan Aug 13 '12 at 2:33
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2 Answers

I was having same problem, Searched a bit and found this solution

VNC session very slow in 12.04 compared to older versions

Running the mentioned command solved the purpose Thanks

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Thanks for the solution! –  B. Roland Sep 23 '12 at 10:56
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up vote 1 down vote accepted

@izx

I would have clicked on your answer except you left it as a comment. So I'm adding this as an answer so it can be closed.

I switched to Unity 2D and that fixed my issues with the PC. I also switched to Unity 2D on my laptop that worked (but you had to move windows around the desktop to get that part of the desktop to refresh). It is still choppy but far less problematic.

FYI, I tried KDE Plasma first. I've loved the look but it was no help in fixing the screen refresh issues.

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Thanks, glad things worked out for you! –  izx Jul 7 '12 at 8:58
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