Same problem here (https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/995395)
$ lspci -v | grep VGA 02:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1) (prog-if 00 [VGA controller])
Same problem here (https:/ /bugs.launchpad .net/ubuntu/ +source/ unity-greeter/ +bug/995395)
$ lspci -v | grep VGA
02:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1) (prog-if 00 [VGA controller])