| Summary: | [radeonsi tessellation] [R9 290/390] Random "texture flickering" (Shadow of Mordor, Tomb Raider, Unigine Heaven 4.0) | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Jan Ziak (http://atom-symbol.net) <0xe2.0x9a.0x9b> |
| Component: | Drivers/Gallium/radeonsi | Assignee: | Default DRI bug account <dri-devel> |
| Status: | RESOLVED FIXED | QA Contact: | Default DRI bug account <dri-devel> |
| Severity: | normal | ||
| Priority: | medium | CC: | bas, vedran |
| Version: | git | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
Shadow of Mordor screenshot
Tomb Raider with tessellation ci-64-tess-blocks.patch Tomb Raider ci-64-tess-blocks screenshot S_03093C_OFFCHIP_BUFFERING(offchip_blocks) if >= CIK |
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Created attachment 124125 [details]
Tomb Raider with tessellation
Tomb Raider without tessellation: OK
Tomb Raider with tessellation: random flickering
I confirm the bug. It affects tessellation on heaven benchmark 4.0. r9 390. This affect me too, in a R9 290, radeonsi driver, using padoka PPA with Kubuntu 16.04. When you disable tesselation in those games the problem goes away. Created attachment 124151 [details] [review] ci-64-tess-blocks.patch Does the attached patch help? If not I would appreciate it if someone could find the first commit that fails (using e.g. bisect). Also, I noticed all reporters use hawaii/grenada pro chips. If anyone with a different chip also has this issue, please let me know. i can confirm this patches generates 0 issues on TAHITI R9-280 and CAPE VERDE HD7700, so it seems it is specific to hawaii/grenada pro (In reply to Bas Nieuwenhuizen from comment #4) > Created attachment 124151 [details] [review] [review] > ci-64-tess-blocks.patch > > Does the attached patch help? If not I would appreciate it if someone could > find the first commit that fails (using e.g. bisect). > > Also, I noticed all reporters use hawaii/grenada pro chips. If anyone with a > different chip also has this issue, please let me know. Unfortunately, ci-64-tess-blocks.patch is making the issue more severe. The frequency of "black triangles on screen" in Tomb Raider is higher. Created attachment 124154 [details]
Tomb Raider ci-64-tess-blocks screenshot
(In reply to Bas Nieuwenhuizen from comment #4) > Does the attached patch help? If not I would appreciate it if someone could > find the first commit that fails (using e.g. bisect). Checking out for example f91c85b29b8261ab3f44d292ed2130d4f577d976 and starting Tomb Raider restarts the X server on my machine. Created attachment 124155 [details] [review] S_03093C_OFFCHIP_BUFFERING(offchip_blocks) if >= CIK This patch fixes the issue on my R9 390. The code is just a guesswork. Maybe it should be (2*offchip_blocks-1) instead? Passing +1 to S_03093C_OFFCHIP_BUFFERING() explains why changing offchip_blocks from 256 to 64 increases the severity of the issue. Thanks a lot for finding the cause of the issue. I pushed e9d3246a7a74282fbbf95ed077e3c3b7750c8ddd to git, that patch should fix the issue. Fixed. Shadow of Mordor renders OK. |
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Created attachment 124124 [details] Shadow of Mordor screenshot See the screenshot attached to this bug. GPU: R9 390 OpenGL version string: 4.3 (Core Profile) Mesa 11.3.0-devel (git-8314dd7) $ export MESA_GLSL_VERSION_OVERRIDE=430 This may be related to the off-chip tessellation patches, but the issue doesn't depend on whether tessellation is enabled or disabled.