Just retested on a fresh install of 15.04 x64 with the nvidia-346
drivers, problem still exists. In between the two nvidia-smi runs shown,
I just switched to the text console with ctl-alt-f1, and then switched
back to X.

graeme@galvatron:~⟫ nvidia-smi 
Tue Aug 11 15:48:00 2015       
+------------------------------------------------------+                       
| NVIDIA-SMI 346.59     Driver Version: 346.59         |                       
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 960     Off  | 0000:01:00.0     N/A |                  N/A |
|  0%   58C    P8    N/A /  N/A |   1148MiB /  2047MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|    0            C+G   Not Supported                                         |
+-----------------------------------------------------------------------------+
graeme@galvatron:~⟫ nvidia-smi 
Tue Aug 11 15:48:08 2015       
+------------------------------------------------------+                       
| NVIDIA-SMI 346.59     Driver Version: 346.59         |                       
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 960     Off  | 0000:01:00.0     N/A |                  N/A |
|  0%   59C    P0    N/A /  N/A |    526MiB /  2047MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|    0            C+G   Not Supported                                         |
+-----------------------------------------------------------------------------+


** Also affects: nvidia-graphics-drivers-346 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1409110

Title:
  nvidia binary driver leaks vram like crazy

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