Bug 103072

Summary:

[Regression] Hardware video acceleration of VP9 format is broken since kernel 4.13

Product:

DRI

Reporter:

Maxim Baz <bugs.freedesktop>

Component:

DRM/Intel

Assignee:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Status:

CLOSED FIXED

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

major

Priority:

medium

CC:

bugs.freedesktop, intel-gfx-bugs, op8867555, vathsala.nagaraju

Version:

unspecified

Keywords:

bisected, regression

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

ReadyForDev

i915 platform:

BYT, KBL

i915 features:

GEM/execlists

Attachments:

Description	Flags
screenshot_vp9_rendering_issue	none
dmesg when playing vp9 video (4.12.8)	none
dmesg when playing vp9 video (4.13.3)	none

Description Maxim Baz 2017-10-03 09:11:17 UTC

Created attachment 134634 [details]
screenshot_vp9_rendering_issue

See attachment on how a video encoded with VP9 format is being rendered with hardware acceleration enabled since I upgraded the kernel to 4.13.3. There is no issue with playing H264 videos. Downgrading kernel to 4.12.12 resolves the issue. A few people in [1] confirm the same behavior.


Reproducible on ArchLinux with mpv or chromium compiled with VA-API. 

People who confirm this bug have the following CPUs: Intel i7-7820HQ, i7-7500U, Pentium n3450.


This bug was also submitted to the kernel [2], but it was suggested in [1] that this might be a better place to report it.

[1] https://aur.archlinux.org/packages/chromium-vaapi
[2] https://bugzilla.kernel.org/show_bug.cgi?id=197113

Comment 1 Elizabeth 2017-10-03 15:55:48 UTC

Hello Maxim,
Could you please share logs, dmesg and/or kern.log with debug info, drm.debug=0xe log_bug_len=2M (or bigger) on grub.
Thank you.

Comment 2 Ming-Yang Lu 2017-10-04 07:38:37 UTC

Created attachment 134658 [details]
dmesg when playing vp9 video (4.12.8)

Hi Elizabeth,

I'm running into this same issue too.
Here is the dmesg log with `drm.debug=0xe log_bug_len=2M` when playing a vp9 video with `mpv --hwdec=vaapi --vo=vaapi`. It didn't produce new logs when playing the video.

Archlinux
Thinkpad X1 Carbon 5th i7-7500U / HD620
mesa-17.1.8-2
libva-intel-driver 1.8.3-1

Comment 3 Ming-Yang Lu 2017-10-04 07:39:20 UTC

Created attachment 134659 [details]
dmesg when playing vp9 video (4.13.3)

Comment 4 Ming-Yang Lu 2017-10-05 15:32:23 UTC

I did a git-bisect on drm-tip and found this commit is the first bad one:

    [2889caa9232109afc8881f29a2205abeb5709d0c] drm/i915: Eliminate lots of iterations over the execobjects array

before this commit, vp9 videos rendered as expect.

Comment 5 Chris Wilson 2017-10-05 16:57:57 UTC

Sadly likely to be a forgotten relocation specifier from userspace that happened to work (or at least until it came under GTT pressure). Another option, the one that happened last time would be a forgotten write hazard indicator.

vp9 requires Kabylake?

Comment 6 Ming-Yang Lu 2017-10-06 05:02:07 UTC

(In reply to Chris Wilson from comment #5)
> Sadly likely to be a forgotten relocation specifier from userspace that
> happened to work (or at least until it came under GTT pressure). Another
> option, the one that happened last time would be a forgotten write hazard
> indicator.

Thanks for the hint :)
I just found that intel-vaapi-driver already fixed the issue on the master branch[1].
I think we can close this issue for now.

[1]: https://github.com/01org/intel-vaapi-driver/issues/262

Comment 7 Elizabeth 2017-10-06 14:09:15 UTC

(In reply to Ming-Yang Lu from comment #6)
> (In reply to Chris Wilson from comment #5)
> > Sadly likely to be a forgotten relocation specifier from userspace that
> > happened to work (or at least until it came under GTT pressure). Another
> > option, the one that happened last time would be a forgotten write hazard
> > indicator.
> 
> Thanks for the hint :)
> I just found that intel-vaapi-driver already fixed the issue on the master
> branch[1].
> I think we can close this issue for now.
> 
> [1]: https://github.com/01org/intel-vaapi-driver/issues/262
Thanks for the update. Closing.

Comment 8 Chris Wilson 2017-11-10 09:30:01 UTC

*** Bug 103657 has been marked as a duplicate of this bug. ***

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