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



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.


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


STFW yielded no hits.


Has anyone else seen this?


Any suggestions for debugging or fixing it?


Should I file a bug report against 'lightdm'?


David


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