How can I investigate the cause of total hang? Is there some information that I should pay attention to in order to get some hint?

[Mike Marchywka]

On Thu, Jul 02, 2020 at 12:17:11PM +0100, Colin Law wrote:
> On Thu, 2 Jul 2020 at 07:11, 孙世龙 sunshilong <sunshilong369 at gmail.com> wrote:
> >
> > Hi,
> >
> > My x86 machine sometimes hangs, suddenly not responding in
> > any way to the mouse or the keyboard.
> >
> > How can I investigate the cause of total hang? Is there some
> > information that I should pay attention to in order to get some hint?
> 
> Does the Caps Lock light still go on and off when you hit the key?  If
> not then the machine has probably crashed completely.
> On reboot look in /var/log/syslog to see what it says.

I just had a mouse problem like this :) Also try 
ctrl-alt-F1 and ctrl-alt-F7 . If you can get to the
console, then you can hunt around the log files and ps 
etc. Maybe something like "find /var -mtime -1 " or something
if system is not normally too busy. 

In my case, the left button on the mouse died and I was
sure the display manager crashed. After installing gdm over lightdm,
I finally realised the problem. I've found that 

cat /dev/input/mouse0 | od 

or something similar may help although just moving it will generate
data. 


> 
> Colin
> 
> >
> > --
> > ubuntu-users mailing list
> > ubuntu-users at lists.ubuntu.com
> > Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
> 
> -- 
> ubuntu-users mailing list
> ubuntu-users at lists.ubuntu.com
> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users

-- 

mike marchywka
306 charles cox
canton GA 30115
USA, Earth 
marchywka at hotmail.com
404-788-1216
ORCID: 0000-0001-9237-455X