Public bug reported:

I suppose this is a bug with the nvidia driver, but I'm not sure. After
the second-to-last routine software update (which I think updated the
nvidia driver), changing window content is only refreshed if the window
is moved.

Ubuntu 12.04.5 LTS, kernel 3.2.0-91-generic,
NVidia driver installed: 340.93-0ubuntu0.0.0.1,
Thinkpad laptop with nvidia graphics card (see below),
Window manager: Gnome Classic

How to reproduce the bug: Log in under Gnome Classic. Open Gnome
terminal. Execute some command (ls). Open new tab in terminal. Execute
some other command (ps), just to have different tab contents. Switch
back and forth between the tabs using the mouse. After some switches,
neither the tab rider is activated nor the tab content is refreshed any
longer. Only if you move the window, the tab rider gets activated and
the tab content is refreshed. The same problem occurs in other
applications (e.g. in thunderbird when selecting an email --- email list
entry is not marked and email content is not shown, only if you move the
window), so it is not application-specific.

The bug disappears when using the window manager "Gnome Classic (no
effects)" instead (which is "non-compositing" in contrast to "Gnome
Classic"). The bug is also present in other window magagers ("Ubuntu").

Side remark: I tried but failed to switch back to an earlier version of
the nvidia driver (from 340 to 331) using synaptic: When deinstalling
340 and installing 331 instead, synaptic complains that it depends on
340. So I can only guess that the bug is caused by the nvidia driver.

Any help would be highly appreciated as the bug is really annoying.

% nvidia-smi 
Tue Oct  6 16:13:30 2015       
+------------------------------------------------------+                       
| NVIDIA-SMI 340.93     Driver Version: 340.93         |                       
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  NVS 5400M           Off  | 0000:01:00.0     N/A |                  N/A |
| N/A   44C    P8    N/A /  N/A |    194MiB /  1023MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Compute processes:                                               GPU Memory |
|  GPU       PID  Process name                                     Usage      |
|=============================================================================|
|    0            Not Supported                                               |
+-----------------------------------------------------------------------------+

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nvidia-340 340.93-0ubuntu0.0.0.1
ProcVersionSignature: Ubuntu 3.2.0-91.129-generic 3.2.71
Uname: Linux 3.2.0-91-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.11
Architecture: amd64
Date: Tue Oct  6 16:10:32 2015
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=C
 SHELL=/bin/tcsh
SourcePackage: nvidia-graphics-drivers-340
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-340 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1503310

Title:
  window content doesn't refresh, only if window is moved

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