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I’ve found a workaround for the issue, but, it won’t work for everyone. I installed an old PCI graphics card in my Dell PowerEdge R630 and did a complete reinstall of Ubuntu 14.04. Before the reinstall I did try adding drivers for the card, but, that caused X to crash on launch. The only other thing I had to do was to disable the integrated VGA graphics in to BIOS.
Thank you all for your help.
Eric
kbb, I haven’t found a solution yet. I’m not fully convinced that this is entirely an Xorg issue since the only thing that seems to cause the problem is NoMachine. It seems to me if these were simply an Xorg bug other configurations would trigger the problem. But, in my experience both the direct attached display and remote X11 work just fine.
Eric
Sorry for the late reply fra81, I didn’t receive an email notifying someone had replied to this thread.
Based on your suggestion I investigated my graphics driver setup and it seems that I don’t have a driver for my card. And, although the issue has been reported to Ubuntu and there has been quite a bit of discussion there doesn’t appear to be any agreement on a solution. One suggestion was to install xserver-xorg-video-vesa, but, due to dependencies issues it will not install on Ubuntu 14.04.
https://bugs.dogfood.paddev.net/ubuntu/+source/xorg-server/+bug/1316035
*-display UNCLAIMED
description: VGA compatible controller
product: G200eR2
vendor: Matrox Electronics Systems Ltd.
physical id: 0
bus info: pci@0000:09:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm vga_controller bus_master cap_list
configuration: latency=64 maxlatency=32 mingnt=16
resources: memory:90000000-90ffffff memory:91800000-91803fff memory:91000000-917fffff
I’m not sure what to try next.
Eric