Public bug reported:

Binary package hint: xserver-xorg-driver-nv

I noticed this bug when doing 'make expand' during Chandler full build,
as explained here:
http://chandlerproject.org/Developers/BuildingChandlerDesktop#The%20long%20and%20more%20difficult%20way.
Specifically, it happens when the wxPython source tarball is unpacked
and the list of files is streamed in gnome-terminal. Typically the fan
goes on high, slows down, high again, then power off. Maybe automatic
power off due to overheating. Pretty scary, so unless I don't have to
reproduce this on purpose I'd rather not.

The computer is a Dell Latitude D820 (I've written more about this
machine in http://chandlerproject.org/Journal/UbuntuOnLatitudeD820):
Intel® Core™ 2 Duo T7600 (2.33GHz) 4M L2 Cache, 667Mhz Dual Core; 15.4
inch Wide Screen WSXGA+ LCD Panel, 1680x1050 pixels; 2.0GB, DDR2-667
SDRAM, 2 DIMMS; 512MB NVIDIA® Quadro NVS 120M TurboCache™.

I've seen this issue now with 32-bit Dapper Drake, 64-bit Feisty Fawn
and 64-bit Gutsy Gibbon beta. It happens only with the open source X
drivers. Nvidia drivers do not exhibit this problem. I've also been able
to avoid the power off by minimizing the gnome-terminal window when the
fan started going fast.

** Affects: xserver-xorg-driver-nv (Ubuntu)
     Importance: Undecided
         Status: New

-- 
computer powers off when unpacking large tarball in gnome-terminal, but not 
with nvidia drivers
https://bugs.launchpad.net/bugs/146426
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