Description of problem:
I think this was triggered by using the backlight brightness keys, which are not currently functioning. (Usually these keys work fine for me, not sure if the 4.11.12-200.fc25.x86_64 kernel caused a  change)

Version-Release number of selected component:
mate-power-manager-1.18.0-1.fc25

Additional info:
reporter:       libreport-2.8.0
backtrace_rating: 4
cmdline:        mate-power-manager
crash_function: gpm_kbd_backlight_on_dbus_signal
executable:     /usr/bin/mate-power-manager
global_pid:     3247
kernel:         4.11.12-200.fc25.x86_64
pkg_fingerprint: 4089 D8F2 FDB1 9C98
pkg_vendor:     Fedora Project
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (6 frames)
 #4 gpm_kbd_backlight_on_dbus_signal at gpm-kbd-backlight.c:329
 #5 ffi_call_unix64 at ../src/x86/unix64.S:76
 #6 ffi_call at ../src/x86/ffi64.c:525
 #7 g_cclosure_marshal_generic at gclosure.c:1490
 #12 on_signal_received at gdbusproxy.c:917
 #13 emit_signal_instance_in_idle_cb at gdbusconnection.c:3705

Potential duplicate: bug 1476622