Still happens with
libqt5gui5:
Installed: 5.6.0+dfsg-2
Installed: 5.6.0+dfsg-2
etc. from experimental.
The session never comes back after suspending. The screen briefly shows the mouse cursor, then goes blank until I restart X. No backtrace or other useful information is obviously available. This happens every time with two screens, never with just the laptop screen.