Used gdb from other machine as described in:
This is the displayed error:
Program received signal SIGSEGV, Segmentation fault.
0x00007f000040213c in _nv001626X () from /usr/lib4/xorg/modules/updates//drivers/nvidia_drv.so
As far as I know, that does not provide much info... except you have the source code or the debug info of nvidia_drv.so and know which function is the _nv001626X.
I had also noticed that playing with the stealth button do sometimes help. For me, it looks like I have to push it and restart and keep doing that until the lap stop crashing. But I'm still looking for a pattern.
I could work without Xorg crashing for more than a month or two (bad memory in brain), until I accidentally started my comp from battery. That's when the crashing started again.
Hope this help to fix this annoying bug.
P.S.: Sorry for bad english.