mate-power-manager

** (mate-power-manager:6893): WARNING **: Failed to get brightness: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)

(mate-power-manager:6893): libupower-glib-WARNING **: Couldn't enumerate devices: Message did not receive a reply (timeout by message bus)
TI:15:48:03 TH:0x11968a0    FI:gpm-engine.c FN:gpm_engine_coldplug_idle_cb,842
 - failed to get device list: Message did not receive a reply (timeout by message bus)
Traceback:
    mate-power-manager() [0x4186f7]
    mate-power-manager() [0x417c60]
    /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x135) [0x7ff3f2b86ce5]
    /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x49048) [0x7ff3f2b87048]
    /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0x6a) [0x7ff3f2b8730a]
    mate-power-manager() [0x40843b]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7ff3f2276ec5]
    mate-power-manager() [0x4084f3]