[Bug 100617] New: [Regression] Gnome Shell slow animations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100617

            Bug ID: 100617
           Summary: [Regression] Gnome Shell slow animations
           Product: DRI
           Version: unspecified
          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: grouchomarx.fr at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,
I have installed Debian Stretch on a Thinkpad X201 (ironlake) and Gnome Shell's
animations aren't smooth anymore (30fps max, and lag easily especially on an
external monitor).

I have tried uxa and sna dri2/dri3, modesetting, wayland, with similar results.
I have also checked Fedora.


I was previously using Debian Jessie and the animations were a lot smoother
(60fps max, though only with uxa/dri2).


I have made a bisect on Debian Jessie and have found that the animations aren't
smooth anymore after 
commit 6db906ea8188cd7f731e5ef7391115ee8f5c17c8
uxa/dri2: Reimplement triple buffer support

Unfortunately I failed to test the old driver on Debian Stretch.

So I don't know if it is a Gnome or a driver issue.

Or maybe some driver settings might fix it ?

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