[Bug 91006] New: [SKL][Linux]: Getting huge lag in 4K eDP video playback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91006

            Bug ID: 91006
           Summary: [SKL][Linux]: Getting huge lag in 4K eDP video
                    playback
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: vijayakannanx.ayyathurai at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116552
  --> https://bugs.freedesktop.org/attachment.cgi?id=116552&action=edit
dmesg.log

System Environment:
--------------------------
Platform: SKL Linux
Kernel - (4.1-rc8) 644bfe268feb04544d89b52edba6bef6a2661ddc
drm kernel merge : 2015y-06m-15d-16h-39m-55s
Libdrm - (2.4.61) a1acffd4e0968ffa65b673163574188a00c9ab7e
Mesa - (10.7.0-devel) 7518fc3c66e9b5703b987bccca7970a344deadfa
vaapi - (0.38.0) 4763db1c2133d4e6b92355938ecb6f23a7767b6b
libva - (1.6.0.pre1) 4763db1c2133d4e6b92355938ecb6f23a7767b6b
intel-driver (1.6.0.pre1) 4a1c4d21f3428b08ef765d7f7de75b97006514ac

eDP resolution used : 3200 x 1800

Bug detailed description:
-----------------------------
We are observing huge lag in the video playback with the 4K eDP panels.

Isolation:
----------------------------
1. The same video is playing without lag with 2K eDP panels.

Reproduce steps:
---------------------------- 

1. Boot the SKL with the above mentioned config
2. Play a video 
3. Observe the Video playback lagging issue.

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