Black screen on laptop lid opening/closing with suspend

Hello, there has been this critical issue with XFCE where, when suspending a laptop by closing the lid, the screen stays blank after the machine turns back on. At first, this was thought to be an issue with xfce4-power-manager, but after some work I realized that this is actually a problem with xfce4-settings and it's ./configure options.

I noticed that certain distributions (mainly Arch/Manjaro) configure xfce4-settings with --disable-upower-glib and do not have this issue. Other distros (Fedora, Ubuntu, etc) do have this problem since they don't use this option. A few like CentOS have an earlier version of UPower (0.99.7) and do not have this issue. Finally, after modifying Manjaro's package to not have that option, the issue occurred was reproducible.

I don't really know what to do about this myself, however looking at UPower's release notes for 0.99.8, it might have something to do with the function up_client_get_devices. Hope that we can get this fixed!