[Bug 94980] New: [HSW xf86-video-intel] 2D acceleration slows to a crawl from 4.4.6 -> 4.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94980

            Bug ID: 94980
           Summary: [HSW xf86-video-intel] 2D acceleration slows to a
                    crawl from 4.4.6 -> 4.5
           Product: DRI
           Version: DRI 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: rafael.ristovski at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123011
  --> https://bugs.freedesktop.org/attachment.cgi?id=123011&action=edit
Xorg.0.log - full debug

When switching from 4.4.6 to 4.5 2D acceleration becomes slow when TearFree is
enabled. 
Disabling TearFree fixes this at the expense of having tearing.
3D acceleration is unaffected.

Randomly when moving terminal windows at high speed, small parts of other
windows get "stuck" to the terminal window (might be caused by weird slow
refresh?)

Details:
Whole Xorg stack from git
xf86-video-intel from git

HW:
i7-4500U with HD 4400 Graphics
Running Gentoo

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