[Bug 91864] New: [SKL Regression] 2D and 3D accelerated programs are slow after booting on 4.2.0-rc8 drm-intel-nightly kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91864

            Bug ID: 91864
           Summary: [SKL Regression] 2D and 3D accelerated programs are
                    slow after booting on 4.2.0-rc8 drm-intel-nightly
                    kernel
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: olivierx.berthier at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118062
  --> https://bugs.freedesktop.org/attachment.cgi?id=118062&action=edit
dmesg log file

Regression
-----------
2D and 3D accelerated programs become slow with all drm-intel kernels after
booting on 4.2.0-rc8 drm-intel-nightly.

Setup :
-------

Hardware
Platform: SKY LAKE Y A0 
CPU : Intel(R) Core(TM) m5-6Y57 CPU @ 1.10GHz (family: 6, model: 78  stepping:
3)
MCP : SKL-Y  D1 2+2 (ou ULX-D1)
QDF : QJK9 
CPU : SKL D1
Chipset PCH: Sunrise Point LP C1       
CRB : SKY LAKE Y LPDDR3 RVP3 CRB FAB2
Reworks : All Mandatories + FBS02,FBS03, F23, O-02 & O-06

Software 
BIOS : SKLSE2R1.R00.X093.B02.1507222151 07/22/2015
ME FW : 11.0.0.1158
Ksc (EC FW): 1.15
Linux : Ubuntu 14.04 LTS 64 bits

Kernel : 4.2.0-rc8 drm-intel-nightly
commit 78a01ed08ac09d84cb47db59dd10fe9de1ee6c4a
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Mon Aug 31 18:43:56 2015 +0300

    drm-intel-nightly: 2015y-08m-31d-15h-42m-59s UTC integration manifes

cairo: (HEAD, tag: 1.14.2) 93422b3cb5e0ef8104b8194c8873124ce2f5ea2d
libdrm: (HEAD, origin/master, origin/HEAD, master)
c3301d013444b7b5d02c58307e188e292d8cf18a
mesa: (HEAD, origin/10.6) 99793e2541510fe208d29e69fedf97a6fff006f8
xf86-video-intel: (HEAD, origin/master, origin/HEAD, master)
9b0ed16385ae076c262a2e09639822d9488ccf57
xserver: (HEAD, origin/master) 533fb627398e20f863234d780f4463e37007515b

Steps :
-------
1. Boot on the 4.2.0-rc8 drm-intel-nightly kernel.
2. Use the system.
3. Reboot on the 4.2.0-rc8 drm-intel-testing-2015-08-28 or older kernel (eg.
4.2.0-rc4 drm-intel-testing-2015-07-31) .
4. Use the system.

Actual result :
---------------
On step 2, the Unity desktop environment is slow, and after rebooting on
another kernel (steps 4), the system kept to be slow. This has an impact on all
2D and 3D applications and the test suites (see the piglit sanity test result
file). On Unity environment, compiz is now a very heavy cost process on the
CPU.

Expected result :
----------------
No lag on all kernels.

Also tested with mesa on origin/master, same result.

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