Answered in
https://www.mobileread.com/forums/sh...2&postcount=23 
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Note that it shouldn't effectively break BT in nickel on exit, but I'm not really familiar with how BT is handled at all, I just know that it's a bit of a mess, partly because of weird kernel/hardware limitations.
I don't have any plans for looking into any of it (end even less so for actually supporting BT), but patches would be heartily welcome

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