Bug 75725 - [HSW regression] Upgrading from kernel 3.13.x to 3.14.x causes FPS drops during video playback in XBMC
Summary: [HSW regression] Upgrading from kernel 3.13.x to 3.14.x causes FPS drops duri...
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: x86-64 (AMD64) Linux (All)
: medium critical
Assignee: Ville Syrjala
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-03-03 19:44 UTC by bugzilla1
Modified: 2017-07-24 22:55 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments
dmesg (61.75 KB, text/plain)
2014-03-03 19:44 UTC, bugzilla1 		no flags Details
dpkg -l |grep mesa (2.05 KB, text/plain)
2014-03-03 19:45 UTC, bugzilla1 		no flags Details
Xorg.0.log (23.27 KB, text/plain)
2014-03-03 19:46 UTC, bugzilla1 		no flags Details
dmesg (drm.debug=0xe) (184.09 KB, text/plain)
2014-03-03 19:52 UTC, bugzilla1 		no flags Details
git bisect log (2.57 KB, text/plain)
2014-03-04 18:26 UTC, bugzilla1 		no flags Details
[PATCH] drm/i915: Add a workaround for HSW scanline counter weirdness (2.97 KB, patch)
2014-03-06 19:20 UTC, Ville Syrjala 		no flags Details | Splinter Review
View All

Description bugzilla1 2014-03-03 19:44:42 UTC 
Created attachment 95055 [details]
dmesg

XBMC is an OpenGL application which can use VAAPI to decode videos.

Since upgrading to a kernel of the 3.14.x-family (from 3.14-rc1), I experience significant FPS drops in video playback.

Reverting back to a kernel of the 3.13.x-family resolves that issue. Watching videos under 3.14.x is therefore at the moment impossible.

Turning VSync off or on doesn't solve the problem.

Required information:
Chipset: HSW
uname -m: x86_64
uname -r: 3.14.0-031400rc5-generic
Distribution: Ubuntu 13.10
Machine or mobo model: Fujitsu ESPRIMO Q920
Display connector: DisplayPort (conncted to the TV via a HDMI adapter)

Please find attached:
dmesg
Comment 1 bugzilla1 2014-03-03 19:45:21 UTC 
Created attachment 95056 [details]
dpkg -l |grep mesa

dpkg -l |grep mesa
Comment 2 bugzilla1 2014-03-03 19:46:22 UTC 
Created attachment 95057 [details]
Xorg.0.log

Xorg.0.log
Comment 3 bugzilla1 2014-03-03 19:47:04 UTC 
(In reply to comment #0)
> Created attachment 95055 [details]
> dmesg
> 
> XBMC is an OpenGL application which can use VAAPI to decode videos.
> 
> Since upgrading to a kernel of the 3.14.x-family (from 3.14-rc1), I
> experience significant FPS drops in video playback.
> 
> Reverting back to a kernel of the 3.13.x-family resolves that issue.
> Watching videos under 3.14.x is therefore at the moment impossible.
> 
> Turning VSync off or on doesn't solve the problem.
> 
> Required information:
> Chipset: HSW
> uname -m: x86_64
> uname -r: 3.14.0-031400rc5-generic
> Distribution: Ubuntu 13.10
> Machine or mobo model: Fujitsu ESPRIMO Q920
> Display connector: DisplayPort (conncted to the TV via a HDMI adapter)
> 
> Please find attached:
> dmesg

Exact model is: Core i5-4570T
Comment 4 bugzilla1 2014-03-03 19:52:11 UTC 
Created attachment 95058 [details]
dmesg (drm.debug=0xe)

dmesg output with drm.debug=0xe
Comment 5 Daniel Vetter 2014-03-03 20:31:04 UTC 
This smells funny. I bisection to the offending commit would be awesome, see e.g.

https://wiki.ubuntu.com/Kernel/KernelBisection
Comment 6 bugzilla1 2014-03-04 18:07:00 UTC 
(In reply to comment #5)
> This smells funny. I bisection to the offending commit would be awesome, see
> e.g.
> 
> https://wiki.ubuntu.com/Kernel/KernelBisection

Done. :-)

Bisecting: 0 revisions left to test after this (roughly 0 steps)
[8072bfa6045a264d3913102a35fab125b06603a2] drm/radeon: Move the early vblank IRQ fixup to radeon_get_crtc_scanoutpos()
Comment 7 bugzilla1 2014-03-04 18:25:41 UTC 
Also commit 095163bad59bfeed294a81e0d873fa8943e4fa01 maybe causing it...
Comment 8 bugzilla1 2014-03-04 18:26:28 UTC 
Created attachment 95108 [details]
git bisect log

git bisect log
Comment 9 Daniel Vetter 2014-03-04 18:28:50 UTC 
Ville scored one!
Comment 10 Ville Syrjala 2014-03-05 21:30:09 UTC 
I pushed something here:
git://gitorious.org/vsyrjala/linux.git atomic_plane_14

It's not the final patch since there are still some unanswered questions on how the hardware actually behaves. I can't be really sure it will fix the problem, but it should fix _a_ problem. In any case, please give it a try and report back if it helps, or if I'm barking up the wrong tree with this.
Comment 11 bugzilla1 2014-03-06 18:22:39 UTC 
(In reply to comment #10)
> I pushed something here:
> git://gitorious.org/vsyrjala/linux.git atomic_plane_14
> 
> It's not the final patch since there are still some unanswered questions on
> how the hardware actually behaves. I can't be really sure it will fix the
> problem, but it should fix _a_ problem. In any case, please give it a try
> and report back if it helps, or if I'm barking up the wrong tree with this.

FPS drops are gone for me.
Comment 12 Ville Syrjala 2014-03-06 19:20:09 UTC 
Created attachment 95234 [details] [review]
[PATCH] drm/i915: Add a workaround for HSW scanline counter weirdness

This patch should fix it for 3.14.

I also pushed this on top of the latest drm-intel-fixes tree to:
git://gitorious.org/vsyrjala/linux.git hsw_vblank
Comment 13 Jani Nikula 2014-03-11 13:19:30 UTC 
(In reply to comment #12)
> Created attachment 95234 [details] [review] [review]
> [PATCH] drm/i915: Add a workaround for HSW scanline counter weirdness

Reporter, please try the final patch so we can add a Tested-by on it. Thanks.
Comment 14 bugzilla1 2014-03-11 16:44:02 UTC 
Thank you very much. Works fine. :-)
Comment 15 Jani Nikula 2014-03-12 16:49:23 UTC 
Fix pushed, thanks for the report.

commit fcb818231f81e22b2c3a76d7ef416237fa0c7609
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Tue Mar 11 12:58:45 2014 +0200

    drm/i915: Add a workaround for HSW scanline counter weirdness

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