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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