[Bug 88716] New: [HSW GT1] trying to flip between 2 buffers of different strides

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88716

            Bug ID: 88716
           Summary: [HSW GT1] trying to flip between 2 buffers of
                    different strides
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: myfoolishgames at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112675
  --> https://bugs.freedesktop.org/attachment.cgi?id=112675&action=edit
20150122_fifo_just_slowdown.log

I'm experiencing slowdowns of the system usually on heavy usage of Chromium
(running another app that use the GPU like Kodi or image editor will hasten the
appearance of the slowdowns).
The easiest way to reproduce is to open few tabs with allot of images.

Although before 3.19 I had GPU hangs (
https://bugs.freedesktop.org/show_bug.cgi?id=83677 ) I did still encountered
the slowdowns when using i915 kernel parameters to suppress the hangs so at
least for me it's not a regression (at least from kernel 3.15).

system: Acer C720, Haswell GT1, 2995U
kernel: 3.19rc5
xf86-video-intel: 2.99.916
mesa: 10.4.2
xorg-server: 1.16.3
distro: Arch Linux x86_64

attached logs:
20150122_fifo_just_slowdown.log: journald output for the time frame of the
slowdown
20150122_fifo.log : full journald output
20150122_Xorg.0.log: Xorg.0.log

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