| Bug ID | 88658 |
|---|---|
| Summary | Slow video playback on Kabini |
| Product | Mesa |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | jtossenb@gmail.com |
| QA Contact | dri-devel@lists.freedesktop.org |
I am using a 64-bit Kabini based system (AMD Athlon 5350) with Kodi 14.0 on an up-to-date Arch linux. Kodi plays this https://dl-web.dropbox.com/get/hi10p_sample.mp4?w=AAC8qnXfS0xxWbd5Fc2bkvWxMxeqlUiSkL-Dxe5C5BDVyw&dl=1&_subject_uid=6760021 small sample file fine with kernel 3.16.x, but with kernel >= 3.17 the playback is only 1 fps (like a slideshow). It is a hi10p video, so Kodi uses pure software decoding. I've done a git bisect between 3.16 and 3.17-rc1 and found that 02376d8282b88f07d0716da6155094c8760b1a13 is the first bad commit. commit 02376d8282b88f07d0716da6155094c8760b1a13 Author: Michel Dänzer <michel.daenzer@amd.com> Date: Thu Jul 17 19:01:08 2014 +0900 drm/radeon: Allow write-combined CPU mappings of BOs in GTT (v2) v2: fix rebase onto drm-fixes Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Then I applied the patch found in comment 30 of bug 84627 attachment 11024 [details] (as I use 64-bit system). This patch worked around the problem on 3.17 and on the latest 3.19-rc5 kernel as well and now Kodi plays the above video 24 fps.
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