Actually I spotted the cg3 problem already. You'll need to add some debugging to the cg6 case as I can't find any problems with the blanking code there. If the cg6 is not the primary console, probably the blank function simply isn't being invoked.
I redid my printks to be KERN_DEBUG and now unblanking does not happen, only one call to cg6_blank and this does the blanking case. But only cursor disappears.
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