I've tried linux-next today (4.6.0-rc3-next-20160412) as I've read there are
quite some intel driver changes there and this issue with freezing is gone. I
can now log-in with monitor attached and everything still works.
The message that we posted here still appears thus confirming what Matt said
Happens also on a brand new XPS 15 9550 laptop. I tried also today's
kernel git (with some drm fixes for i915).
System is installed anew with Debian testing up-to-date, latest kernel
code and intel video driver 2:2.99.917+git20160218-1.
Symptoms:
- system boots (lightdm)
- laptop screen blinks li
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