Andrew Ayre wrote:
> I have noticed that perhaps one time in five Linux will partially 
> shutdown during milling. It's a bit hard to describe but the Gnome 
> desktop is replaced with a text screen of what looks like the tail end 
> of the bootup sequence:
> 
> Operation  [OK]
> Another operation [OK]
> Running startup scripts in /etc/rc.local [OK]
> 
> There are no messages and EMC2 continues to generate pulses - which 
> cause the X and Y axis to move the spindle in a straight line. A quick 
> press of the power button turns off the power.
> 
> I booted and checked dmesg, user.log, syslog and messages. Nothing was 
> recorded to indicate a problem. The syslog only had the 30 minute marks 
> in it.
This may be a crash of the X-windows server.  You didn't, by any 
chance, hit Ctrl-Alt-Backspace?  That is the command to kill the 
X server.  If X is actually crashing, the message file is in
/var/log/XFree86.0.log  and may show some useful info.

Jon

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