Now I am able to stabilize the system with the following trick
$sudo nvidia-xconfig --registry-dwords="PowerMizerEnable=0x1;
PerfLevelSrc=0x2222; PowerMizerDefault=0x3; PowerMizerDefaultAC=0x1"
The /etc/X11/xorg.conf should have a line in Section "Screen" like
Option "RegistryDwords" "PowerMizerEnable=0x1;
PerfLevelSrc=0x2222; PowerMizerDefault=0x3; PowerMizerDefaultAC=0x1"
Explanation:
According to http://tutanhamon.com.ua/technovodstvo/NVIDIA-UNIX-driver/,
the power setting is configurable. I believe that it is the Adaptive
thing that makes X unhappy when it switches performance levels. The
reason why it becomes stable when an external display is plugged in is
also probably due to switching to max performance and stays at that
level. Therefore, I simply disable it when on AC power (using Max
performance setting) and on battery (using min performance).
--
NVIDIA - Xorg crashes (empty backtrace) with segfault OR "general protection"
in ld-2.10.1.so
https://bugs.launchpad.net/bugs/507233
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