[henkv]

Hi,
When I use the direct to plane render method and vc4-kms-v3d on a pi2 or pi3, playing video's results in flickering and the following error in the kodi.log:

2021-03-06 15:32:39.942 T:1348    ERROR <general>: CDRMAtomic:rmAtomicCommit - test commit failed: (Invalid argument) - falling back to last successful atomic request
2021-03-06 15:32:39.942 T:1348    DEBUG <general>: CDRMAtomicRequest::LogAtomicDiff - DRM Atomic Request Diff:
2021-03-06 15:32:39.943 T:1348    ERROR <general>:  
                                                   Object: plane    ID: 83
                                                     Property: FB_ID    ID: 17    Value: 209
                                                   Object: plane    ID: 76
                                                     Property: SRC_X    ID: 9    Value: 0
                                                     Property: SRC_Y    ID: 10    Value: 0
                                                     Property: SRC_W    ID: 11    Value: 125829120
                                                     Property: SRC_H    ID: 12    Value: 70778880
                                                     Property: CRTC_X    ID: 13    Value: 4294967286
                                                     Property: CRTC_Y    ID: 14    Value: 18446744073709551612
                                                     Property: CRTC_W    ID: 15    Value: 1922
                                                     Property: CRTC_H    ID: 16    Value: 1080
                                                     Property: FB_ID    ID: 17    Value: 211
                                                     Property: CRTC_ID    ID: 20    Value: 82

The EGL render method does not have this problem, but is a lot slower.

My system is arch linux arm 32 bit with kernel 5.10.20-1-ARCH and kodi 19.0-6

Kodi.log kan be found here: https://paste.kodi.tv/irugohojax.kodi

[graysky]

This is a known bug:
https://forum.kodi.tv/showthread.php?tid=360664
https://forum.kodi.tv/showthread.php?tid=361097

[henkv]

@graysky. The bug you mentioned is about zoom levels on a pi4. This issue is on a pi2 and pi3 with default zoom level.
I checked, changing zoom levels has no effect on this issue.

I don't have this issue when using fake kms. But this is not recommended and has some issues with sound.

[Klojum]

don't have this issue when using fake kms.

RPi2/3 are presently not upto par as far as Kodi 19.0 goes. Most efforts have gone into the RPi4. RPi2/3 versions should catch up later on. Visit the LibreELEC forum for more info/details.

[graysky]

@Klojum - Although the OP was about a RPi3, two of the links are showing the flickering with the similar debug info on RPi4B.  Is there any specific posts on the LE forum you would point us to?

[henkv]

I found out that the flickering only happens when the subtitles are enabled or when the control buttons are visible.

[HiassofT]

In LibreELEC we only include the patch to hide pixelwrap issue on RPi4 in RPi4 builds: https://github.com/LibreELEC/LibreELEC.t...sues.patch

This needs the kernel patch (which also fixes zoom), otherwise you get the flickering issues.

If you build from pocornmix' gbm branch on/for RPi0-3 you will also have the pixelwrap patch in there so you'll likely see the issues on RPi0-3, too (and need the kernel patch).

so long,

Hias

[henkv]

I checked LibreELEC and it does not have this issue (latest snapshot, same config)

[graysky]

In LibreELEC we only include the patch to hide pixelwrap issue on RPi4 in RPi4 builds: https://github.com/LibreELEC/LibreELEC.t...sues.patch

This needs the kernel patch (which also fixes zoom), otherwise you get the flickering issues.

If you build from pocornmix' gbm branch on/for RPi0-3 you will also have the pixelwrap patch in there so you'll likely see the issues on RPi0-3, too (and need the kernel patch).

so long,

Hias

@HiassofT - Arch ARM is applying @popcornmix 10 patches (his Matrix-gbm branch) which includes the hide pixelwrap patch.  Our kernel is also patched with vc4_place: don't reject fractional source coords.  Is that the kernel patch to which you refer?  Can you please link it if not?  Thanks!

[HiassofT]

@graysky yes, that's the patch I was referring to.

Not 100% sure though ATM if the kernel patch only applies to vc6/RPi4 or also to vc4/RPi0-3.

The atomic commit error message looks a lot like the one I got on RPi4 without the kernel patch.

popcornmix should be able to tell more

so long,

Hias

[graysky]

Thanks, Hias.  This issue is present with both patches applied (kernel patch and ffmpeg patch) on both RPi4 and RPi3.

[popcornmix]

@graysky yes, that's the patch I was referring to.

Not 100% sure though ATM if the kernel patch only applies to vc6/RPi4 or also to vc4/RPi0-3.

The fractional coordinates kernel commit is wanted on pi2/3 and pi4.

[graysky]

@graysky yes, that's the patch I was referring to.

Not 100% sure though ATM if the kernel patch only applies to vc6/RPi4 or also to vc4/RPi0-3.

The fractional coordinates kernel commit is wanted on pi2/3 and pi4.

@popcornmix - I am applying the fractional coordinates kernel commit to both Arch ARM's RPi2/3's kernel and the RPi4's kernel but still observing the flickering/debug log messages on certain videos/zoom levels.  Could there be something else needed?

[henkv]

I rebuilt kodi-rpi-legacy with the following patch reverted: 0001-hack-try-to-hide-pixel-wrap-issues.patch and it looks like the issue is fixed now on my pi2 and pi3.

[graysky]

I rebuilt kodi-rpi-legacy with the following patch reverted: 0001-hack-try-to-hide-pixel-wrap-issues.patch and it looks like the issue is fixed now on my pi2 and pi3.

I need to know if this is general enough to revert in the official kodi-rpi-legacy package.  Can you tell which exactly which video exhibits this when you use the repo package?  I have a RPi3B I can dust off for testing.

Have you tried any jellyfish test clips or test clips from the kodi wiki?

https://www.jell.yfish.us
https://kodi.wiki/view/Samples