[Bug 36332] New: Missing rendering in Unity dash

[Bug 36332] New: Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

           Summary: Missing rendering in Unity dash
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: chalserogers@gmail.com


Forwarded from https://bugs.launchpad.net/ubuntu/+source/unity/+bug/726033

When rendering the Unity dash icons are frequently missing from the rendering.
This video is a good demonstration of the problem:
https://launchpadlibrarian.net/68813544/unity-bug.ogv

This works on r600g, nouveau, i915 and i965, so it looks like it's a bug
somewhere in r300g.

The dash rendering uses FBOs and ARB shaders, with glscissor for clipping.

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

--- Comment #1 from Jay Taoko <jay.taoko@canonical.com> 2011-04-17 18:10:21 PDT ---
Created an attachment (id=45747)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45747)
Xorg.0.log

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

--- Comment #2 from Jay Taoko <jay.taoko@canonical.com> 2011-04-17 18:11:05 PDT ---
Created an attachment (id=45748)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45748)
dmesg.txt

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

--- Comment #3 from Jay Taoko <jay.taoko@canonical.com> 2011-04-17 18:11:41 PDT ---
Created an attachment (id=45749)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45749)
glxinfo.txt

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

--- Comment #4 from Christopher James Halse Rogers <chalserogers@gmail.com> 2011-04-17 18:18:27 PDT ---
This occurs on both mesa master (as of 2011/04/18, shown in logs) and 7.10.2.

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

--- Comment #5 from Jay Taoko <jay.taoko@canonical.com> 2011-04-17 18:24:09 PDT ---
The bug can be reproduced on ATI R300/400/500 GPUs. These GPUs are no longer
supported by fglrx so I couldn't verify if it was strictly a driver issue or if
there was some error in our program code. However, the problem cannot be
reproduced with a Radeon HD 4670 and the open source driver (or fglrx). Nor can
it be reproduced with Intel GPUs such as the GMA 950 and above.

The bug manifest itself in the Unity Dash. When an action is performed to show
more icons in the dash, the rendering does not happen. Elements of the Dash
only appear after the mouse moves over them, but this is the result of Unity
refreshing the rendering. Some elements of the dash also disappear. This make
me think that clipping could be involved. Unity makes extensive use of opengl
scissoring.

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[Bug 36332] Missing rendering in Unity dash

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36332

Pavel Rojtberg <pavel@rojtberg.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|dri-devel@lists.freedesktop |maraeo@gmail.com
                   |.org                        |

--- Comment #6 from Pavel Rojtberg <pavel@rojtberg.net> 2011-04-20 02:49:45 PDT ---
there is now a workaround in this commit:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/natty/nux/natty/revision/26


// jaytaoko: This is a hack for what looks like a bug (#726033) in the radeon
opensource driver
// on R300/400/500. Rather than passing a null region to glScissor, we give the
clip area a 1 pixel width.

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