http://bugs.freedesktop.org/show_bug.cgi?id=5092





------- Comment #24 from [EMAIL PROTECTED]  2007-07-05 14:04 PST -------
It's a little more complicated than that. The Unichromes have an AGP command
queue which feeds a "Virtual Queue" in vram. If the lockup occurs during a
texture read, it's hard to tell exactly what primitive caused it, because it
may be in the middle of reading 2MB of data.

The AGP command queue has never been completely stable, so first thing would be
to turn that off. "EnableAGPDMA" to "false" would eliminate AGP-related
lockups.

Then the Virtual command queue can also be turned off using a 2D driver option,
but I can't remember which ATM. 

After that, all command register writes should stall until the device is ready
to accept them, which may help tracking this issue down.

/Thomas


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