I started having this issue [both monitors black out, no mouse our keyboard input, still able to SSH in over the network] after upgrading from 11.04 to 12.04. Generally, when I SSH after the freeze/hang, Xorg is taking 100% CPU and I see "EQ overflowing" in the Xorg.0.log.
My setup looks like this. Ubuntu 12.04 Linux box 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux NVIDIA Driver Version: 304.88 [Additional Drivers: version current-updates] Quadro FX 2800M (GPU 0) Two displays: ViewSonic VX2439 Series (DFP-1), LGD (DFP-0) I believe that my issue is related to the following in /var/log/syslog (dmesg): [99101.294734] NVRM: GPU at 0000:01:00.0 has fallen off the bus. [99101.294742] NVRM: GPU at 0000:01:00.0 has fallen off the bus. There seem to be lots of threads concerning this error message with NVIDIA hardware, but no universal solution. http://www.nvnews.net/vbulletin/showthread.php?p=2571522 https://devtalk.nvidia.com/default/topic/567297/linux/linux-3-10-driver-crash/1 https://devtalk.nvidia.com/default/topic/537302/linux/both-screens-black-xorg-at-100-cpu-overflow-errors-in-xorg-0-log-nvidia-driver-310-14-quadro-fx/ http://www.cyberciti.biz/faq/debian-ubuntu-rhel-fedora-linux-nvidia- nvrm-gpu-fallen-off-bus/ http://forums.gentoo.org/viewtopic-t-925156-postdays-0-postorder-asc- start-25.html I have tried enabling TwinView in xorg.conf ala palewire in #45, but that did not seem to make any difference. I'm pretty sure the external monitor, or more likely its GPU, is involved because I do not have the problem when traveling without it. I have no reliable way to reproduce the issue. However, it does seem to happen often when I am scrolling a window, such as in a browser or paging in a terminal. Several times the screens have gone blank while I still have a finger on the mouse scrollwheel. Of course, this will not reliably produce a problem. WBB -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/882710 Title: [NVIDIA] Monitor(s) black out and session freezes. "NVRM: GPU at 0000:01:00.0 has fallen off the bus." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/882710/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
