Bug 99008

Summary:	Some video flickers on kodi. Found bad commit.
Product:	xorg	Reporter:	Marcoz <marco.zattamz>
Component:	Driver/Radeon	Assignee:	xf86-video-ati maintainers <xorg-driver-ati>
Status:	RESOLVED MOVED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Marcoz 2016-12-06 19:02:34 UTC

Some videos play very bad with driver version 7.8.0 on Kodi.
Video flickers and when I exit, Kodi interface flickers as well, many artefacts form when moving the cursor with the keyboard.
I am on Archlinux with kernel 4.8.12-2-ARCH.
My card: 
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8330]

The problem appears both with vdpau enabled and disabled from Kodi settings.
I bisected and found that the first bad commit is:

aa07b365d7b0610411e118f105e49daff5f5a5cf

Comment 1 Rafał Miłecki 2016-12-06 19:40:52 UTC

The commit you bisected looks unlikely, it's:
https://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=aa07b365d7b0610411e118f105e49daff5f5a5cf
aa07b365d7b ("Add .editorconfig file")

Comment 2 Marcoz 2016-12-06 20:41:23 UTC

Hi Rafał, you are right. It seemed to me quite strange to me but it was the first time bisecting for me and that's what git told me.

However, I spotted that one very close commit is to enable DRI 3 by default.
Overriding this in xorg.conf and forcing DRI 2 seems to solve the problem...
Is there a way to make DRI 3 work or my card is a too lame?

As I said it is a Radeon HD 8330 which is integrated on my board: 
Asrock qc500-itx.

Comment 3 Marcoz 2016-12-06 20:58:43 UTC

One followup:
If I enable TearFree and DRI 3 the problem is solved at the expenses of a less smooth playback.
With only DRI 2 in xorg.conf and without specifying any TearFree option the video playback is much better.

Comment 4 Michel Dänzer 2016-12-07 08:30:47 UTC

I can't reproduce this with kodi 17.0 beta 5 and current Mesa Git master. It sounds like it's most likely due to your version of kodi making incorrect assumptions about the contents of the back buffer after glXSwapBuffers.

There are two possible workarounds:
* In kodi, set Settings / System / Display / "Number of buffers used by graphics driver" to 3
* Start kodi like this to disable DRI3 for it: LIBGL_DRI3_DISABLE=1 kodi

Comment 5 Martin Peres 2019-11-19 07:58:08 UTC

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati/issues/166.

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