i'm posting an excerpt from a problem report from my radar bug id
6189041, filed September 2008, which i marked as "critical: crash/
hang/data loss". So far it got completely ignored by Apple since over
half a year, although i updated it multiple times with additional
failure cases. I'm posting here to hear if anybody else experienced
these problems or filed radars for these. Given the lack of response,
i'm scared it could persist in 10.5.7 as well.
The bug is present on all Leopard versions from at least 10.5.3 to at
least 10.5.6, both when using CGL and AGL for fullscreen contexts,
both with the GF-8800 and as well with the Geforce 9xxx cards found
in the new MacBooks and MacMinis, pretty much with any recent NVidia
card. It makes all NVidia equipped machines completely unusuable for
the kind of dual-display stereo work that our users want to do. As
most current Apple machines are equipped with NVidia GPU's it slowly
turns into a nightmare for users that want to buy new hardware and
actually use it for productive work, but can't buy any configuration
that actually works.
Original radar report follows:
02-Sep-2008 01:22 AM Mario Kleiner:
Summary:
When using a dual-display setup on an Intel MacPro with NVidia
Geforce 8800 under Leopard 10.5.3 and 10.5.4, and opening two double-
buffered fullscreen OpenGL contexts on the two attached displays,
bufferswaps fail and malfunction in random ways on the first opened
OpenGL context, as soon as the 2nd context is created.
Symptoms are failure to synchronize bufferswaps to vertical retrace,
failure to execute bufferswaps at all, multiple seconds stalls of the
graphics system and - when trying to close the OpenGL contexts or
terminate the application - complete system hangs, requiring a hard
reboot.
This makes dual display OpenGL applications a complete no-go for all
our users.
During this malfunctions, the system.log quickly fills with error
messages like...
Attached you'll find a simple reproducer app "DualHeadBugReproducer".
Run the application on a Intel MacPro with NVidia Geforce 8800 on a
dual-display setup under 10.5.3 or 10.5.4.
Run it in a terminal window like this: ./DualHeadBugReproducer 0 1
The application will use CGL to open a fullscreen context on the
first display, enable sync of bufferswaps to vertical retrace, then
swap the back- and frontbuffer in a loop, alternating between an all
black and all white image. A mouse-click will stop the loop, printout
the average FPS, then open a context on the 2nd display and perform
the same task. Up to there everything is fine. On the next mouse
click, it will try to execute bufferswaps on the first display again,
now the trouble begins: Bufferswaps are now not synced to retrace,
take multiple dozen seconds to execute, or don't execute at all.
Another mouseclick will show the same problem on the 2nd display. The
next mouseclick will cause the app to close the contexts. This will
either take very long or cause a complete system hang, requiring a
hard reboot.
thanks for any comments or suggestions,
-mario
*********************************************************************
Mario Kleiner
Max Planck Institute for Biological Cybernetics
Spemannstr. 38
72076 Tuebingen
Germany
e-mail: email@hidden
office: +49 (0)7071/601-1623
fax: +49 (0)7071/601-616
www: http://www.kyb.tuebingen.mpg.de/~kleinerm
*********************************************************************
"For a successful technology, reality must take precedence
over public relations, for Nature cannot be fooled."
(Richard Feynman)
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