[Bug 59810] New: triple display issue on IvyBridge platform ( i5-3470T + Q77 ).

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59810

          Priority: medium
            Bug ID: 59810
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: triple display issue on IvyBridge platform ( i5-3470T
                    + Q77 ).
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: terence.chiang at intel.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 73589
  --> https://bugs.freedesktop.org/attachment.cgi?id=73589&action=edit
dmesg and DRI log

triple display issue on IvyBridge platform ( i5-3470T + Q77 ).
While xorg configured as 1920x1080 at 60Hz x 3, Ivy bridge platform randomly can't
bring up DP3/HDMI2 port and the  fail-rate is about 50%.

Tried following Linux distribution:
* Yocto 1.3 x86_64 with IvyBridge BSP.  (Kernel 3.4.11)
* Ubuntu 12.10 x86_64 with intellinuxgraphic 12Q4 driver. (Kernel 3.6.5)

Increased the logbuffer size with log_buf_len=4M but it seems like i915 kernel
module will clear dmesg.
dump dmesg between every time when start/stop xorg.  
The 6th time I stopped xorg, DP1 port failed to display in text mode.
Please see attached file "dmesg.12.log" and files in "DRI_LOG_dmesg.12.log".

Then 7th time I start xorg, DP1 still not display any signal.
Please see attached file "dmesg.13.log" and files in "DRI_LOG_dmesg.13.log".

Then 8th time I stopped xorg, DP1 came back in text mode.
Please see attached file "dmesg.14.log" and files in "DRI_LOG_dmesg.14.log".

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