Bug#921132: lightdm: Laptop with external monitor Xfce lock screen causes 100% CPU
Package: lightdm
Version: 1.18.3-1
Severity: normal
Dear Maintainer,
I have a Dell Inspiron E1505 laptop with Debian 9.7 amd64 and Xfce. I
use an external monitor, keyboard, and mouse via a KVM switch. When I
lock the screen, the CPU goes to 100%:
2019-02-01 15:29:57 dpchrist@tinkywinky ~
$ top -b -n 1 | head
top - 15:30:01 up 7:59, 2 users, load average: 1.19, 1.17, 1.08
Tasks: 241 total, 2 running, 239 sleeping, 0 stopped, 0 zombie
%Cpu(s): 30.6 us, 5.2 sy, 0.3 ni, 63.7 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 2043088 total, 87792 free, 926800 used, 1028496 buff/cache
KiB Swap: 1952764 total, 1786848 free, 165916 used. 422364 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6539 lightdm 20 0 587524 51660 25884 R 87.5 2.5 103:00.92 lightdm-gt+
6528 root 20 0 259824 19520 13004 S 18.8 1.0 12:47.44 Xorg
6915 dpchrist 20 0 43276 3464 2856 R 6.2 0.2 0:00.03 top
~
Please advise with trouble-shooting steps.
David
-- System Information:
Debian Release: 9.7
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-8-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 depends on:
ii adduser 3.115
ii dbus 1.10.26-0+deb9u1
ii debconf [debconf-2.0] 1.5.61
ii libaudit1 1:2.6.7-2
ii libc6 2.24-11+deb9u3
ii libgcrypt20 1.7.6-2+deb9u3
ii libglib2.0-0 2.50.3-2
ii libpam-systemd 232-25+deb9u8
ii libpam0g 1.1.8-3.6
ii libxcb1 1.12-1
ii libxdmcp6 1:1.1.2-3
ii lightdm-gtk-greeter [lightdm-greeter] 2.0.2-1
Versions of packages lightdm recommends:
ii xserver-xorg 1:7.7+19
Versions of packages lightdm suggests:
pn accountsservice <none>
ii upower 0.99.4-4+b1
pn xserver-xephyr <none>
-- debconf information:
* shared/default-x-display-manager: lightdm
lightdm/daemon_name: /usr/sbin/lightdm
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