[Bug 75725] New: [HSW] Upgrading from kernel 3.13.x to 3.14.x causes FPS drops during video playback in XBMC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75725

          Priority: medium
            Bug ID: 75725
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW] Upgrading from kernel 3.13.x to 3.14.x causes
                    FPS drops during video playback in XBMC
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bugzilla1 at gmx.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 95055
  --> https://bugs.freedesktop.org/attachment.cgi?id=95055&action=edit
dmesg

XBMC is an OpenGL application which can use VAAPI to decode videos.

Since upgrading to a kernel of the 3.14.x-family (from 3.14-rc1), I experience
significant FPS drops in video playback.

Reverting back to a kernel of the 3.13.x-family resolves that issue. Watching
videos under 3.14.x is therefore at the moment impossible.

Turning VSync off or on doesn't solve the problem.

Required information:
Chipset: HSW
uname -m: x86_64
uname -r: 3.14.0-031400rc5-generic
Distribution: Ubuntu 13.10
Machine or mobo model: Fujitsu ESPRIMO Q920
Display connector: DisplayPort (conncted to the TV via a HDMI adapter)

Please find attached:
dmesg

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