Been having a problem in recent weeks that I'm unable to fix or even diagnose.
When I log out of my desktop, the machine just hangs with a blank X windows screen. (I.e., black screen with mouse cursor pointer.) I'm able switch to a console and successfully issue the "sudo poweroff" command from there. But the system never brings me back to an X login screen.
I'm not sure what package is causing the problem here. I run XFCE with LXDM as my DM. My initial guess was that this is an issue with xfce4-session, since a) I see a zombie "sh" process under xfce4-session when I look at the process list, and b) when I kill xfce4-session I successfully get back to a login screen. But I also see that the xfce4-session package hasn't been updated since September, so I'd think it's unlikely that that's what's causing the problem.
Anyone got any pointers in the right direction for me on this?