Bug 96398

Summary: [radeonsi tessellation] Single-pixel rasterization issue (Shadow of Mordor)
Product: Mesa Reporter: Jan Ziak (http://atom-symbol.net) <0xe2.0x9a.0x9b>
Component: Drivers/Gallium/radeonsiAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED FIXED QA Contact: Default DRI bug account <dri-devel>
Severity: normal    
Priority: medium CC: 0xe2.0x9a.0x9b, bas
Version: git   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: tessellation off
tessellation on
tessellation on

Description Jan Ziak (http://atom-symbol.net) 2016-06-06 09:31:42 UTC 
GPU: R9 390
Mesa 12.1.0-devel (git-be365f3)

Please see the screenshots attached to this issue.
Comment 1 Jan Ziak (http://atom-symbol.net) 2016-06-06 09:32:33 UTC 
Created attachment 124352 [details]
tessellation off
Comment 2 Jan Ziak (http://atom-symbol.net) 2016-06-06 09:32:49 UTC 
Created attachment 124353 [details]
tessellation on
Comment 3 Jan Ziak (http://atom-symbol.net) 2016-06-06 09:33:03 UTC 
Created attachment 124354 [details]
tessellation on
Comment 4 Jan Ziak (http://atom-symbol.net) 2016-07-20 12:50:28 UTC 
Steps to reproduce:

1. Select low graphics quality
2. Restart game
3. Enable tessellation in game settings
4. Restart game
5. Start the benchmark from game menu
6. The benchmark title screen is showing white flickering pixels on Talion's leather baldric

Mesa 12.1.0-devel (git-3c78d89) 2016-07-20
Comment 5 Nicolai Hähnle 2016-07-20 17:12:03 UTC 
Can you produce an apitrace?
Comment 6 Jan Ziak (http://atom-symbol.net) 2016-07-20 17:15:53 UTC 
(In reply to Nicolai Hähnle from comment #5)
> Can you produce an apitrace?

I will try tomorrow.
Comment 7 Jan Ziak (http://atom-symbol.net) 2016-07-21 16:00:55 UTC 
(In reply to Nicolai Hähnle from comment #5)
> Can you produce an apitrace?

http://atom-symbol.net/f/2016-07-21/ShadowOfMordor.trace.xz

The issue should manifest itself in some frames at the end of the trace.
Comment 8 Nicolai Hähnle 2016-07-25 20:19:30 UTC 
Thanks, I can reproduce this on Polaris. No idea what's causing yet, though it seems there are actually some piglit tests affected by tesselation bugs as well (notably, arb_shader_image_load_store-coherency).
Comment 9 Marek Olšák 2016-08-25 13:48:44 UTC 
I can't reproduce this on Tonga and Polaris11. It seems to be fixed. Can you please confirm?
Comment 10 Jan Ziak (http://atom-symbol.net) 2016-08-25 14:03:17 UTC 
(In reply to Marek Olšák from comment #9)
> I can't reproduce this on Tonga and Polaris11. It seems to be fixed. Can you
> please confirm?

I can't reproduce the issue as well. It was still there just a few weeks ago.

I will do a more thorough check later today and close this issue if the problem is no longer there.

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