[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[]                          |[RV710/M92] Soft lock
                   |                            |caused by UVD (linux 4.0.1)

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[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #1 from Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com> ---
Hello.

Card:Mobility Radeon HD 4570

I set those at start-up:
echo performance > /sys/class/drm/card0/device/power_dpm_state
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

When trying to use VDPAU/UVD (e.g. with ffmpeg). The GPU soft-locks. X can be
killed remotely. But the GPU is not reset properly. GL and VDPAU don't work
after I start X again.

This bug was net present in 3.18.2.

dmesg output attached.

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[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #2 from Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com> ---
Created attachment 115621
  --> https://bugs.freedesktop.org/attachment.cgi?id=115621&action=edit
dmesg output

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[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #3 from Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com> ---
Looking closer at what's going on. This could be codec related.

I just noticed that the bug is triggered with MPEG2(the particular file is
1080i) but not with H264.

And the bug goes back to at least 3.18.6.

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[Bug 90360] [RV710/M92] Soft lock caused by UVD (linux 4.0.1)

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #4 from Christian König <deathsimple@vodafone.de> ---
The UVD block on the RV710 doesn't support MPEG2 in hardware. Because of that
we fall back to shader based MPEG2 decoding and that seems to crash the GPU.

IIRC this used to work on RV710, but I'm not 100% sure.

Best solution I can see is to configure your player to not try to use hw
acceleration for MPEG2.

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[Bug 90360] [RV710/M92] GPU lockup caused by shader based MPEG2 decoding

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[RV710/M92] Soft lock       |[RV710/M92] GPU lockup
                   |caused by UVD (linux 4.0.1) |caused by shader based
                   |                            |MPEG2 decoding

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[Bug 90360] [RV710/M92] GPU lockup caused by shader based MPEG2 decoding

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #5 from Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com> ---
Yes.

I already have my player configured to only use VDPAU with H264(by default).

However, playback is not the only use-case of hardware acceleration. I actually
stumbled upon this bug when a script called "ffmpeg" with "-hwaccel vdpau".

So, this bug can be triggered in scenarios that are not user-visible. Which
makes it more severe IMHO.

May I suggest disabling hardware MPEG2 decoding completely for the time being?

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[Bug 90360] [RV710/M92] GPU lockup caused by shader based MPEG2 decoding

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

--- Comment #6 from no.spam.to.me@ish.de ---
(In reply to Christian König from comment #4)
> Because of
> that we fall back to shader based MPEG2 decoding and that seems to crash the
> GPU.

Who is responsible for shader based MPEG2 decoding?

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[Bug 90360] [RV710/M92] GPU lockup caused by shader based MPEG2 decoding

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https://bugs.freedesktop.org/show_bug.cgi?id=90360

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #7 from Martin Peres <martin.peres@free.fr> ---
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