[Bug 67526] New: [HSW ULT bisected] I-G-T testdisplay -a causes screen black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67526

          Priority: medium
            Bug ID: 67526
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT bisected] I-G-T testdisplay -a causes screen
                    black
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83281
  --> https://bugs.freedesktop.org/attachment.cgi?id=83281&action=edit
System boot messages

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 HSW ULT has eDP and miniHDMI. With eDP and miniHDMI plugged in, I execute
./testdisplay -a. 

[root at x-hswu32 tests]# ./testdisplay -a
CRTS(3):[0]  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48
138780   <--- this is eDP's mode.
CRTS(3):[0]  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x48
148500   <--- this is HDMI's mode, both eDP and HDMI screen will turn to black. 

In addition, In my bisecting, I found that for some bad commits, when screen
turns to black, system can't be accessed by ssh. But there are some commits can
be accessed. Here I restrict this issue to "black screen" and get the bisect
info:

4906557eb37b7fef84fad4304acef6dedf919880 is the first bad commit
commit 4906557eb37b7fef84fad4304acef6dedf919880
Author: Rodrigo Vivi <rodrigo.vivi at gmail.com>
Date:   Thu Jul 11 18:45:05 2013 -0300

    drm/i915: Hook PSR functionality

    PSR must be enabled after transcoder and port are running.
    And it is only available for HSW.

    v2: move enable/disable to intel_ddi
    v3: The spec suggests PSR should be disabled even before backlight (by
pzanoni)
    v4: also disabling and enabling whenever panel is disabled/enabled.
    v5: make it last patch to avoid breaking whenever bisecting. So calling for
        update and force exit came to this patch along with enable/disable
calls.
    v6: Remove unused and unecessary psr_enable/disable calls, as notice by
Paulo.

    CC: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
    [danvet: Drop the psr exit code in the busy ioctl since I didn't merge
    that part of the infrastructure yet - it needs more thought.]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 df6a542740e60b0ae2ea72ea72caf0e3aed17869
5c326989834a202dd43030eb4b6d69e1eb804ba2 

M      drivers

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