[snb mesa fallback] Slideshow on the stage 18 of Unigine Heaven 3.0 benchmarking after upgrading to Raring

[adem]

Ubuntu 13.04 Raring Ringtail, xserver-xorg-video-intel 2:2.21.6-0ubuntu4, Intel® Core™ i5-2320 with HD 2000 (Sandy Bridge)

I've noticed some FPS loss in the games right after upgrading from Quantal to Raring. Then I decided to make a benchmark in Unigine 3.0 Heaven. Average FPS looked the same until the stage 18, when slideshow was started. It took about 2 minutes to get the stage passed, but in Quantal it took only 12 seconds.

Here are 2 videos from 12.10 & 13.10 to show what is actually happen, I have used lowest possible settings to run Unigine Heaven 3.0 with 1024x576 resolution:
Kubuntu 12.10 http://www.youtube.com/watch?v=j89SyEayS34 (no slideshow at 2:50-3:05)
Kubuntu 13.04 http://www.youtube.com/watch?v=_OD3ORU6TnQ (slideshow at 2:50-5:02)

Also some random benchmark's results from games that i play and Unigine Heaven 3.0 (12.10 / 13.04):
Warsow: 145.9 / 120.5 fps
Xonotic: 160.0 / 152.1 fps
Unigine Heaven 3.0: 325 / 274 scores

/etc/X11/xorg.conf:

Section "Device"
        Identifier "intel"
        Driver "intel"
        Option "AccelMethod" "sna"
 Option "SwapbuffersWait" "false"
 Option "TearFree" "true"
EndSection

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xserver-xorg-video-intel 2:2.21.6-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Mon May 6 17:38:51 2013
InstallationDate: Installed on 2013-04-29 (7 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to raring on 2013-04-29 (6 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Timo Aaltonen (tjaalton)]

confirmed here, some stages are really slow, but in addition to that I only see the sky and some smoke & black grass when running the test, although it could mean something else is wrong with my system..

[Chris Wilson (ickle)]

This is the slow path: brw_workaround_depthstencil_alignment()

[Chris Wilson (ickle)]

It's been "fixed" in latest mesa -- at the cost of potential rendering errors.

[madbiologist (me-again)]

Is this still occurring on Ubuntu 13.10 "Saucy Salamander"?

[Launchpad Janitor (janitor)]

[Expired for mesa (Ubuntu) because there has been no activity for 60 days.]