[Bug 96714] New: Random freezes with multiple displayport monitors connected to Thinkpad X260 with ultradock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96714

            Bug ID: 96714
           Summary: Random freezes with multiple displayport monitors
                    connected to Thinkpad X260 with ultradock
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dxtr at emacs.church
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124769
  --> https://bugs.freedesktop.org/attachment.cgi?id=124769&action=edit
Journal

As discussed on https://bugs.freedesktop.org/show_bug.cgi?id=96554 and
https://bugs.freedesktop.org/show_bug.cgi?id=93580 I experience random freezes
when I have connected two displayport monitors.

I can see no pattern in when and how it happens.

I am attaching the log from one session when it happened (booted with
drm.debug=0xe).

As of this writing I am running kernel version 4.7.0-rc5 with patches from
https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=for-bug93580.

The symptom is that the two external monitors just goes black and the display
on the laptop sort of fades to noise that gets darker and darker until it's
completely black.
The system is, from what I can see, totally unresponsive. I can't even SSH into
it to try to figure out what's happening.
And as you can see in the log it simply just stops logging.

Maybe this is a hint?

Earlier today I also saw an interesting extra effect.
The system had frozen up like this while I wasn't nearby.
This has never happened before (It was always happened when I've been doing
stuff) and because I wasn't nearby I didn't know how long it had been like
that.
When I finally booted the computer up again some of the noise was still on the
screen for an hour or so until it had slowly faded away.
It was even there in pre-bootloader.

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