[Bug 89998] New: DisplayPort Cant's set 60hz refresh rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89998

            Bug ID: 89998
           Summary: DisplayPort Cant's set 60hz refresh rate
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: hawara at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I have a Philips Brilliance 288P monitor, which should support 3840x2160 @ 60Hz
through DisplayPort. 
My computer is a Lenovo ThinkPad T550 with Intel HD Graphics 5500, which also
should support this resolution and refresh rate.

However, only 30Hz mode works - If I switch the display to 60hz (or when it
tries this setting automatically during login)
I just see weird grey lines on half of the screen, other half is black
(Screenshot -
https://www.dropbox.com/s/1toa4v4clxg71jf/2015-04-13%2012.04.04.jpg?dl=0 )

xrandr reports both refresh rates:
DP1 connected 3840x2160+2880+0 (normal left inverted right x axis y axis) 621mm
x 341mm
   3840x2160     60.00 +  30.00* 

I'm running kernel 4.0.0-rc7-drm_intel_nightly_20150411 (on 3.19 or mainline
4.0-rc7 kernel the system locks up on entering this refresh rate) with
parameter i915.enable_ips=0
Monitor DisplayPort mode is set to 1.2.

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