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Commit 2848f048 authored by Keith Packard's avatar Keith Packard
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Switch from PIPE_VBLANK to PIPE_EVENT interrupts. 

My 965GM gets interrupts stuck when using the old PIPE_VBLANK interrupt.
Switch to the PIPE_EVENT interrupt mechanism, and set the PIPE*STAT
registers to use START_VBLANK on 965 and VBLANK on previous chips.
parent ce373357
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