[Bug 27521] New: corrupted rendering with vbo + kms + rv515 (hits Blender 2.50!)

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27521

           Summary: corrupted rendering with vbo + kms + rv515 (hits
                    Blender 2.50!)
           Product: Mesa
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/Radeon
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: wixorpeek@gmail.com


Created an attachment (id=34773)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=34773)
program triggering the bug (compile with -std=c99)

Environment:
  - Debian Linux, vanilla kernel 2.6.33,
  - mesa 7.7.1-1,
  - radeon ddx 1:6.12.192-2 (changelog says: pull from upstream master up to
commit 5c256808)
  - libdrm 2.4.18-3
  - Radeon x1300 (xorg says: 1002:7142:1043:0162 ATI Technologies Inc RV515 PRO
[Radeon X1300/X1550 Series] rev 0, ...)

When using Blender's 2.50 VBO rendering mode, some mesh faces are not drawn.
The rendering is otherwise clean and correct. This occurs iff both VBO and KMS
are enabled.

Using BuGLe (http://www.opengl.org/sdk/tools/BuGLe) i have obtained trace of
opengl calls made by Blender (attached) and created a minimal program need to
reproduce the bug. It should render rotating gray cube with slight orange
silhouette. Program's source is attached, see comments there for details.

AFAIR the bug was already sitting there when I first tried KMS, which was
around October 18.

In the other news, if VBO is large, I get this on the console:
*********************************WARN_ONCE*********************************
File r300_draw.c function r300TryDrawPrims line 671
Rendering was 7 commands larger than predicted size. We might overflow  command
buffer.
***************************************************************************
This does not depend on KMS being enabled or not. 242406 indices and 40803
vertices are sufficient to reproduce this, but it's not strict lower bound.

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