So, it's not a parity detection problem from the stream, but it may be a
hole in the stack from viafb to softdevice (both included) that make the
whole parity broken.
Try adding a printk in viafb_wait_for_sync (via_fbobj.c), just before it returns:
printk(KERN_INFO "wait vsync: %d %d %d\n", field_option, p->irq_cnt & 1, ret);
You _should_ see a stream of messages all identical. Let me know whether anything changes when the field parity 'goes wrong'.
Mark
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