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Re: Debian 9.2 amd64 Xfce lock screen -> 100 %CPU by lightdm-gt+




On 10/11/17 21:43, davidson wrote:
On Wed, 11 Oct 2017, David Christensen wrote:
I have a Dell Inspiron 6400 laptop with:

2017-10-11 20:06:21 dpchrist@tinkywinky ~
$ cat /etc/debian_version
9.2

2017-10-11 20:07:34 dpchrist@tinkywinky ~
$ uname -a
Linux tinkywinky 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux


Recently, I've noticed that if I lock the screen and walk away, when I return the CPU fan is on high speed.  When I unlock the screen, the CPU Graph indicates that one of my two CPU cores was pegged at 100%, but dropped off once I logged in.


If I lock the screen and SSH in from another machine, 'top' says:
...
 PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND 7473 lightdm   20   0  587348  51332  25584 R  94.6  2.5   0:14.52 lightdm-gt+
...

AFAICT, that command name is truncated. In interactive top, you can
scroll with right-arrow, to view the rest of the name. With that
information, your search results might improve.

Could be lightdm-gtk-greeter? Or something else, I guess.
...

Thanks for the tip. Making my Xfce Terminal wider, I see more of the name, but it's still truncated (as are several others with long names). RTFM top(1) -- I can use the -b (batch mode), -n 1 (number of iterations), and -w (output-width-override) options and redirect the output to file:

2017-10-11 22:51:04 dpchrist@tinkywinky ~
$ top -b -n 1 -w
top - 22:52:43 up 15:45,  2 users,  load average: 0.98, 0.53, 0.27
Tasks: 232 total,   3 running, 229 sleeping,   0 stopped,   0 zombie
%Cpu(s): 13.7 us, 2.3 sy, 0.2 ni, 83.4 id, 0.4 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem :  2043196 total,   535484 free,   780640 used,   727072 buff/cache
KiB Swap:  1952764 total,  1744820 free,   207944 used.   980428 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
9957 lightdm 20 0 587348 51196 25444 R 88.2 2.5 2:41.03 lightdm-gtk-gre
...


Searching for a package 'lightdm-gtk-gre':

2017-10-11 23:00:37 dpchrist@tinkywinky ~
$ apt-cache search lightdm-gtk-gre
lightdm-gtk-greeter - simple display manager (GTK+ greeter)
lightdm-gtk-greeter-settings - settings editor for the LightDM GTK+ Greeter


Your hunch of 'lightdm-gtk-greeter' looks right.


Checking the bugs for 'lightdm-gtk-greeter' -- nope:

https://bugs.debian.org/cgi-bin/pkgreport.cgi?dist=unstable;package=lightdm-gtk-greeter


David