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Disable threaded opengl for PPC

I've the following problem with iMac G5 that I think its dued to an ATI driver bug, I want to be sure of it before filling a radar disabling opengl multithreading, what's the fastest way to do it? (THREAD 3 is the one that crashed)

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_INVALID_ADDRESS (0x0001) at 0x1b126000

Thread 0:
0   libSystem.B.dylib                   0x9002c4b8 semaphore_wait_trap + 8
1   libSystem.B.dylib                   0x9005f388 pthread_join + 436
2   libGLImage.dylib                    0x9455a808 glgS3TCCompress + 560
3   libGLImage.dylib                    0x9454fbb8 glgProcessColor(GLDPixelMode const*, GLGOperation const*, unsigned long) + 24032
4   libGLImage.dylib                    0x945483f8 glgProcessPixels + 792
5   ...apple.ATIRadeon9700GLDriver      0x078d9f34 gldUpdateDispatch + 28076
6   GLEngine                            0x0786d624 gleTextureSubImageCopy + 272
7   GLEngine                            0x0780ec20 glCopyTexSubImage2D_Exec + 1404
8   libGL.dylib                         0x92f1849c glCopyTexSubImage2D + 164
9   RenderSystem_GL                     0x0668bf2c Ogre::GLTextureBuffer::blitFromTexture(Ogre::GLTextureBuffer*, Ogre::Box const&, Ogre::Box const&) + 1584
10  RenderSystem_GL                     0x0668d7d8 Ogre::GLTextureBuffer::blitFromMemory(Ogre::PixelBox const&, Ogre::Box const&) + 1312
11  org.ogre3d.Ogre                     0x021f78e8 Ogre::HardwarePixelBuffer::blitFromMemory(Ogre::PixelBox const&) + 88
[...]

Thread 2:
0   libSystem.B.dylib                   0x90054388 semaphore_timedwait_signal_trap + 8
1   libSystem.B.dylib                   0x90070be8 pthread_cond_timedwait_relative_np + 556
2   com.apple.audio.CoreAudio           0x91469794 CAGuard::WaitFor(unsigned long long) + 204
3   com.apple.audio.CoreAudio           0x914696a4 CAGuard::WaitUntil(unsigned long long) + 304
4   com.apple.audio.CoreAudio           0x914678e8 HP_IOThread::WorkLoop() + 852
5   com.apple.audio.CoreAudio           0x91467580 HP_IOThread::ThreadEntry(HP_IOThread*) + 16
6   com.apple.audio.CoreAudio           0x914583dc CAPThread::Entry(CAPThread*) + 96
7   libSystem.B.dylib                   0x9002bd08 _pthread_body + 96

Thread 3 Crashed:
0   libGLImage.dylib                    0x94559344 createInterpAlphaBlock + 184
1   libGLImage.dylib                    0x9455a4b8 compressTexture + 1520
2   libSystem.B.dylib                   0x9002bd08 _pthread_body + 96

--
Bye,
Gabry

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