Comment 7 for bug 1170911

I also think there are posts for different problems pointing at this bug. I followed one of them here and added my name to the list. But now I too am not sure of this and have removed myself as being affected by it.

Here are my experiences, in case they help. I have a Core 2 Duo desktop and a GeForce GTX 640 SE video card. I initially performed a clean 13.04 64 bit install, with no encryption and no LVM. I used the NVidia driver (310 in my case, since that's the one labelled "tested") as the Nouveau driver seemed to cause system instability. I had problems with hanging, both on restart and shut down about as often as Thomas above. Sometimes, when the system failed to shut down, I had the mount errors but sometimes it would hang without them. The system was otherwise stable.

I then reinstalled Ubuntu, this time as 32 bit, just to see what happened. I was able to stay with the Nouveau driver as I had no system instability with it under 32 bit. I did not see any umount/mount errors but less logging to the screen seems to occur with the Nouveau driver, so perhaps I was getting them but was unaware of it. I had no restart/shutdown problems at all. Using the system under this configuration was great - everything seemed to "just work".

I have now tried the NVidia driver (310 again), just to see what happened with it under 32 bit. I find that under 32 bit Ubuntu, it is the NVidia driver causing system instability (reverse of my 64 bit situation), to the point where the system is not really stable enough to use. I have also experienced one hung shutdown attempt (my first since going 32 bit). I also saw cases of the umount/mount errors, though as I said above, perhaps they were also there under Nouveau but just not visible.