Hi,
>
>Basically, the problem is that the video card generates VBL interrupts,
>but the kernel doesn't know what to do with these except on a couple
>of old Apple cards.  The interrupts are therefore only enabled when
>there is an ethernet card in the machine (all nubus interrupts are on
>one wired-OR interrupt line to VIA2/RBV).
>
In an ideal world, closing the card's driver should disable the interrupts,
and booter should close all drivers. (Does it? I don't have the sources at
hand.)

Whether the driver actually does disable its interrupt is anybody's guess.

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