[Pkg-xfce-devel] Bug#878313: lightdm-gtk-greeter: laptop, external monitor, Debian 9.2 amd64 Xfce, lock screen -> 100 %CPU

[David Christensen]

Package: lightdm-gtk-greeter
Version: 2.0.2-1
Severity: normal

Dear Maintainer,

* What led up to the situation?

Install Debian 9 amd64 Xfce on Dell Inspiron 6400 and update.
Connect external monitor, switch screen to external monitor, close laptop lid.
Add CPU Graphs and Action Buttons to Xfce panel.
Enable Action Buttons -> Lock Screen button.
Click on Lock Screen button.
After a while, CPU fan goes to high speed.
Unlock screen.
CPU Graph indicates one CPU was pegged, but returned to normal after
unlocking screen.


* What exactly did you do (or not do) that was effective (or
  ineffective)?

Log in via SSH from another machine and run 'top':

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 


If I enarge the Terminal, I can see more of the COMMAND names.  In this
case, 'lightdm-gtk-gre'.


* What was the outcome of this action?

'lightdm-gtk-greeter' is using 100 %CPU when screen is locked while
using external monitor with laptop.


* What outcome did you expect instead?

%CPU should be at or near 0 for all COMMANDs.


* Additional information:

https://lists.debian.org/debian-user/2017/10/msg00379.html

https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1635125

https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1448214

https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1509780


Thank you,

David



-- System Information:
Debian Release: 9.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages lightdm-gtk-greeter depends on:
ii  libc6                   2.24-11+deb9u1
ii  libcairo2               1.14.8-1
ii  libgdk-pixbuf2.0-0      2.36.5-2+deb9u1
ii  libglib2.0-0            2.50.3-2
ii  libgtk-3-0              3.22.11-1
ii  liblightdm-gobject-1-0  1.18.3-1
ii  libx11-6                2:1.6.4-3

Versions of packages lightdm-gtk-greeter recommends:
ii  adwaita-icon-theme [gnome-icon-theme-symbolic]  3.22.0-1+deb9u1
ii  desktop-base                                    9.0.2+deb9u1
ii  gnome-themes-standard                           3.22.2-2
ii  policykit-1                                     0.105-18

lightdm-gtk-greeter suggests no packages.

-- no debconf information