Bug 67823

Summary: xf86-video-intel 2.21.14-1 slows down gnome-shell with SNA accelleration
Product: xorg Reporter: Volker Holthaus <v.holthaus>
Component: Driver/intelAssignee: Chris Wilson <chris>
Status: RESOLVED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Xorg.0.log none

Description Volker Holthaus 2013-08-06 11:03:30 UTC
Hardware:

NVidia GT555M 

Software:

Arch Linux Kernel 3.10.3-1-ARCH
bumblebee 3.2.1-3
nvidia driver 319.32
xf86-video-intel 2.21.14-1

If i change the accelleration from UXA to SNA the gnome-shell slows dramatically down. No error in the Xorg.0.log or dmesg log.

With the UXA accelleration everything works fine.
Comment 1 Volker Holthaus 2013-08-06 11:06:14 UTC
Xorg 1.14.2-2
Comment 2 Chris Wilson 2013-08-06 12:01:32 UTC
The obvious candidate is 

commit 3f04b6f33f05f8a24698f934a23462269b84917d
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Aug 1 14:49:36 2013 +0100

    sna/dri: Disable TripleBuffering by default for compositors

which is more or less at the request of the gnome-shell authors.
Comment 3 Chris Wilson 2013-08-06 12:03:19 UTC
(Except you didn't actually say this was a regression. And haven't even attached the Xorg log or stated the exact nature of the slowdown).
Comment 4 Volker Holthaus 2013-08-06 13:42:18 UTC
Created attachment 83719 [details]
Xorg.0.log
Comment 5 Volker Holthaus 2013-08-06 13:42:46 UTC
The regression was the slow animation of the windows, when you change to the activity screen and choose workplace with another application.
The applications behavior is normal.
Comment 6 Chris Wilson 2013-08-06 14:33:20 UTC
Option "TearFree" "true"

That's wip and definitely something you do not need whilst running gnome-shell.

*** This bug has been marked as a duplicate of bug 37686 ***

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