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[Stéphan Kochen <stephan@xxxxxxxxx>]

Public bug reported:

Trying to build something on WebGL technology, I noticed that basic
shaders were producing incorrect output. The problem occurs on both
Firefox 4 and Chrome 7. I'm on Intel GM965 hardware, but strangely also
see the exact same problem when I install `libgl1-mesa-swrast` or try
with `LIBGL_ALWAYS_SOFTWARE=1`.

The problem can be reproduced with a fragment shader that simply says:

    gl_FragColor = vec4(1.0, 0.9, 0.9, 1.0);

The output will appear in bright red. I've had several people on Windows
and Maverick with nVidia report that they see a pinkish white, as I was
expecting in the first place.

I've uploaded a simple WebGL example here: (I'll try to attach it.)

    http://stephan.kochen.nl/shaderbug.html

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: libgl1-mesa-dri 7.9~git20100924-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-23.37-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic x86_64
Architecture: amd64
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800
 edid-base64: AP///////wAyDAEGAAAAAAARAQOAIRV4CrNAmVlTjSclUFQAAAABAQEBAQEBAQEBAQEBAQEBEhsAiFAgEDAwGDYAS88QAAAZAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBMR1BoaWxpcHNMQ0QKAAAA/gBMUDE1NFdYNC1UTEE0AOk=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes: 
 edid-base64:
Date: Tue Nov 16 19:13:06 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: Hewlett-Packard HP Compaq 6710b (KE121ET#ABH)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic root=UUID=59c16ced-1ace-403d-9b2b-dcc19e7626d4 ro quiet splash
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=nl_NL.utf8
 SHELL=/bin/bash
SourcePackage: mesa
dmi.bios.date: 01/15/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DDU Ver. F.15
dmi.board.name: 30C0
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2E
dmi.chassis.asset.tag: CNU8092SDY
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68DDUVer.F.15:bd01/15/2009:svnHewlett-Packard:pnHPCompaq6710b(KE121ET#ABH):pvrF.15:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 6710b (KE121ET#ABH)
dmi.product.version: F.15
dmi.sys.vendor: Hewlett-Packard
system:
 distro:             Ubuntu
 codename:           maverick
 architecture:       x86_64
 kernel:             2.6.35-23-generic

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug maverick

-- 
Basic shaders produce incorrect output
https://bugs.launchpad.net/bugs/676183
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