panic if laptop sleeps with external monitor plugged in
If my laptop goes to sleep with a monitor plugged into the DisplayPort, it cannot wake successfully. When I wake it (with mouse or keyboard action), the displays activate, but the machine is hung and the kernel panics a short time later. Both times it's happened, the machine was running X with the monitor attached and powered on. Once the monitor was "in use" (positioned with xrandr and showing part of the desktop). The other time, the monitor was plugged in to the DisplayPort and powered on, but not configured yet (it was simply displaying a mirror of what was on the laptop's display).
Details: this is a Lenovo Carbon X1 with Intel i915 video. This is with a recent 4.7 build. The crash.txt.X files the panic created are attached, and I have the other, larger crash files if needed.
This doesn't happen when no monitor is plugged into the DisplayPort. The machine can go to sleep and wake up reliably.