[Bug 67609] New: [HSW ULT] clonemode of eDP and HDMI causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67609

          Priority: medium
            Bug ID: 67609
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT] clonemode of eDP and HDMI causes system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Environment:
---------------------
Kernel: (drm-intel-next-queued)fae5cbff3e3e4097de2e76178d462b90626c2bdb
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Sun Jul 21 21:37:09 2013 +0200

    drm/i915: clean up crtc timings computation

Description:
--------------------
This issue happens on HSW Harris Beach ULT, this machine has eDP and miniHDMI
display ports. I tested extension mode under X and found that HDMI can clone
eDP but eDP can't clone HDMI. The latter will cause system hang.

Here I attach system boot dmesg and Xorg.0.log.

Reproduce Steps:
--------------------
1. xinit&
2. xrandr --output eDP1 --left-of HDMI1
3. xrandr --output HDMI1 --same-as eDP1 --auto
4. xrandr --output eDP1 --right-of HDMI1
5. xrandr --output eDP1 --same-as HDMI1 --auto   ----> system hang

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