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Old 12-08-2009, 07:13 AM   #1
gonz0
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Registered: Jun 2009
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VNC won't update desktop


Hi!

I recently installed Ubuntu 9.10 on one of my computers, then I tried to connect to it via VNC (I have tried both TightVNC and RealVNC with the same result), from a Windows 7 machine, I also tried from my laptop, running Vista, once again with the same problem.

So... to the problem:

I manage to connect and the desktop appears, all I can do now is move the mouse cursor around, nothing else works... BUT... if i disconnect and then reconnect, all changes I made will be displayed, for example, I clicked an icon, nothing happens, I reconnect and that app have started, or if I type anything, it wont show, then reconnect again and it will appear.

My thoughts about this is that the problem is within the linux computor, maybe the grafic drivers?

Any suggestions? Someone have a solution?

I will be grateful for any info.
If you need more details about my computers, please post me.

Best regards
/Gonzo
 
Old 12-09-2009, 04:03 PM   #2
rjwilmsi
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Registered: Mar 2005
Location: UK
Distribution: opensuse 12.2 x86_64
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I haven't heard of that specific problem but I wonder whether it's to do with the bandwidth and compression settings that you have. Have you tried it with tight compression turned on, in case the problem is simply that you don't have sufficient bandwidth to refresh the screen without using tight compression?
 
Old 12-10-2009, 02:53 AM   #3
RDove
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Registered: Jul 2004
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This is going to sound odd but it worked for us. We had a similar problem at work with a remote server and we ended up lowering the MTU in the network configuration from 1500 to 1200 and it seemed to fix the issues. Lower this by editing /etc/sysconfig/network-scripts/ifcfg-eth0. Add the line MTU=1200 or something. Then restart the network.
 
Old 12-10-2009, 04:24 PM   #4
gonz0
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Registered: Jun 2009
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Quote:
Originally Posted by rjwilmsi View Post
I haven't heard of that specific problem but I wonder whether it's to do with the bandwidth and compression settings that you have. Have you tried it with tight compression turned on, in case the problem is simply that you don't have sufficient bandwidth to refresh the screen without using tight compression?
Thanks for you answer, and yes I'v tried the tight compression, and I really don't think the problem is my bandwidth. If I remember correctly my router is capable up to 300 MBit/s (the N wireless technology) and my Win computer got a 54 MBit/s usb network adapter, the Linux computer is linked with cable to the router and got a 100 MBit/s network adapter. When I use my laptop form work, I think the speed is ~10 MBit/s.

Yet again, thank you for taking your time, if you come up with any other theory, please post again.
/Gonzo
 
Old 12-10-2009, 04:55 PM   #5
gonz0
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Registered: Jun 2009
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Quote:
Originally Posted by RDove View Post
This is going to sound odd but it worked for us. We had a similar problem at work with a remote server and we ended up lowering the MTU in the network configuration from 1500 to 1200 and it seemed to fix the issues. Lower this by editing /etc/sysconfig/network-scripts/ifcfg-eth0. Add the line MTU=1200 or something. Then restart the network.
Hi RDove!

I tried to locate this file without any success (I am, as the topic says, a newbie in the linux world.). I don't know if I didn't search enough or this file is located/named differently in my system (Ubuntu 9.10)?. I think it's a nice guess thou, it's well worth a shot.

Thanks for your time.
/Gonzo
 
  


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