Bug 93740

Summary: weston client egl corruption above certain window size since radeonsi: Enable DCC.
Product: Mesa Reporter: Andy Furniss <adf.lists>
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: bas
Version: git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Andy Furniss 2016-01-16 22:36:05 UTC 
Apologies if this isn't a radeonsi issue.

Before today I've never tested weston so have no knowledge of past behavior.

R9285. Issue happens with weston alone or started from within X.

Weston its self renders OK.

If I start weston-simple-egl it renders OK, but if I enlarge its window the output becomes corrupted, not totally, I can see the triangle is enlarged, but there is lots of random looking memory rendered as well. If shrink it back down it renders OK once it hits original size and is OK smaller.

Output from kodi/mpv is also 90% junk. In the case of mpv I can reduce the vid window down in size, and when it hits the small size that simple-egl starts at it also starts to render OK.

All the wayland/weston code is release. Mesa/llvm gits.
Comment 1 Andy Furniss 2016-01-17 10:58:31 UTC 
I found it

Author: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date:   Wed Oct 21 00:10:39 2015 +0200

    radeonsi: Enable DCC.
Comment 2 Andy Furniss 2016-01-17 11:00:00 UTC 
with commit id this time -

commit 48b5f104ac4e0c3ddbff87520adb7a9d2a254c67
Author: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date:   Wed Oct 21 00:10:39 2015 +0200

    radeonsi: Enable DCC.
Comment 3 Andy Furniss 2016-01-25 22:45:27 UTC 
Re tested with git wayland/weston and the issue persists.

Testing from mesa head R600_DEBUG=nodcc fixes.

nodccclear does not fix.
Comment 4 Marek Olšák 2016-02-25 12:27:59 UTC 
I'm working on this.
Comment 5 Andy Furniss 2016-07-02 22:44:45 UTC 
This is working OK now, not sure which commit fixed it.

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