I do see the same 'g_value_set_uint: assertion `G_VALUE_HOLDS_UINT (value)' failed' message when running 'gnome-power-manager --no-daemon --debug power'.
I do see the same 'g_value_set_uint: assertion `G_VALUE_HOLDS_UINT (value)' failed' message when running 'gnome- power-manager --no-daemon --debug power'.