[Bug 71862] New: [HSW ULT Regression Bisected]HDMI monitor resolution mode setting incorrect when system boot up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71862

          Priority: medium
            Bug ID: 71862
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT Regression Bisected]HDMI monitor resolution
                    mode setting incorrect when system boot up
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: qingshuai.tian at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 89564
  --> https://bugs.freedesktop.org/attachment.cgi?id=89564&action=edit
dmesg of HDMI resolution modeset

Environment:
------------------------
Kernel: (drm-intel-next-queued)f671d117bc0338b67b0a7485882d332fe6c4b570
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Sat Nov 16 16:02:04 2013 +0100

    drm/i915: remove intel_uncore_clear_errors
Description:
------------------------
Machin Info: Lenovo idealpad u330p
When the computer boot up with a HDMI monitor, the resolution mode setting of
the HDMI will be  incorrect. It cannot fullfill the whole screen. I took a
picture to make it clear, and you can check it in the attachment.
This is a regression and I biscted it.

Bisect shows:
9f08ef59a6f71249de8b4e8a26c27075b9e99f9c is the first bad commit
commit 9f08ef59a6f71249de8b4e8a26c27075b9e99f9c
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date:   Thu Oct 31 12:44:21 2013 -0200

    drm/i915: use the correct register when turning VDD off

    That explains why I was seeing 2 consecutive "Turning eDP VDD off"
    messages.
Regression introduced by:
        commit bf13e81b904a37d94d83dd6c3b53a147719a3ead
        Author: Jani Nikula <jani.nikula at intel.com>
        Date:   Fri Sep 6 07:40:05 2013 +0300
            drm/i915: add support for per-pipe power sequencing on vlv

    Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Reviewed-by: Jani Nikula <jani.nikula at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

Reproduce steps:
----------------
1.Plugged in HDMI monitor
2.Boot up the computer

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