Bug 62012

Summary:	Intermittent black geometry
Product:	Mesa	Reporter:	Michel Dänzer <michel>
Component:	Drivers/Gallium/radeonsi	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	major
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Michel Dänzer 2013-03-08 09:38:56 UTC

Some apps intermittently show black instead of the expected coloration for some parts of the geometry.

Investigating this with the rss-glx hack atunnel, the depth buffer appears to have the correct values for the affected areas. So apparently the pixel shader either doesn't run or fails to produce the correct colour values there for some reason.

Comment 1 Michel Dänzer 2013-03-22 14:11:11 UTC

commit c446baa0be1ed2a3bf157519f89a65d348aad17c
Author: Michel Danzer <michel.daenzer@amd.com>
Date:   Fri Mar 22 14:09:10 2013 +0000

    R600: Use legacy (0 * anything = 0) MUL instructions for pow intrinsics

    Fixes wrong lighting in some corner cases with r600g and radeonsi, e.g.
    manifested by failure of two piglit/glean tests and intermittent black
    patches in many apps.

    Tested on SI and RS880.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=62012 [radeonsi]
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58150 [r600g]

    NOTE: This is a candidate for the Mesa stable branch.

    Reviewed-by: Christian König <christian.koenig@amd.com>

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177730 91177308-0d34-0410-b5e6-96231b3b80d8

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