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

From	davidson <davidson@freevolt.org>
Newsgroups	linux.debian.user
Subject	Re: Debian 9.2 amd64 Xfce lock screen -> 100 %CPU by lightdm-gt+
Date	2017-10-13 01:20 +0200
Message-ID	<uzTQ1-2RZ-97@gated-at.bofh.it> (permalink)
References	<uzTQ1-2RZ-95@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 11 Oct 2017, David Christensen wrote:

> debian-user:
>
> 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:
>
> top - 20:02:15 up 12:54,  1 user,  load average: 0.28, 0.42, 0.73
> Tasks: 217 total,   3 running, 214 sleeping,   0 stopped,   0 zombie
> %Cpu(s): 45.6 us,  6.3 sy,  0.0 ni, 48.2 id,  0.0 wa,  0.0 hi,  0.0 si, 0.0 
> st
> KiB Mem :  2043196 total,   820100 free,   661892 used,   561204 buff/cache
> KiB Swap:  1952764 total,  1823528 free,   129236 used.  1145664 avail Mem
>
>  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+
> 7462 root      20   0  259828  19656  13144 S  10.6  1.0   0:01.66 Xorg
> 2463 root      20   0  349180  44600   6068 S   0.4  2.2   3:20.36 mongod
>  514 mongodb   20   0  322476  11664   5328 R   0.2  0.6   2:59.51 mongod
>  638 root      20   0  384964  24920  15168 S   0.2  1.2   6:34.34 Xorg
>  886 root      20   0 3333780  10052   7872 S   0.2  0.5   0:26.93 jsvc
> 7455 dpchrist  20   0   43272   3344   2768 R   0.2  0.2   0:00.06 top
>  993 root      20   0 4413496 289804  10428 S   0.1 14.2   1:36.59 java
> 1113 dpchrist  20   0  191548  17040  12000 S   0.1  0.8   1:01.25 xfwm4
> ...
>
>
> So, lightdm-gt+ is the culprit.

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.

> If/when I run the laptop on the battery, this will be a serious problem 
> (especially given a weak old battery).
>
>
> I don't see this issue in the 'lightdm' bug list:
>
> https://bugs.debian.org/cgi-bin/pkgreport.cgi?dist=unstable;package=lightdm

If the culprit is lightdm-gtk-greeter, it has its own eponymous package.

Hope this helps (a little).

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Debian 9.2 amd64 Xfce lock screen -> 100 %CPU by lightdm-gt+ David Christensen <dpchrist@holgerdanske.com> - 2017-10-13 01:00 +0200
  Re: Debian 9.2 amd64 Xfce lock screen -> 100 %CPU by lightdm-gt+ davidson <davidson@freevolt.org> - 2017-10-13 01:20 +0200

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