> This enables the use of interrupts on r6xx/r7xx hardware. Interrupts
> are implemented via a ring buffer.  The GPU adds interrupts vectors to
> the ring and the host reads them off in the interrupt handler.  The
> interrupt controller requires firmware like the CP.  This firmware
> must be installed and accessible to the firmware loader for interrupts
> to function.

If the fw isn't installed and you load the driver, it leafves the irq 
handler installed by the looks of it, adding the fw thenloading the driver 
really confuses things then.

Dave.

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