5 Replies Latest reply: Nov 15, 2014 4:57 PM by raydsltecholdschool
HenryS Level 2 (295 points)

After installing a Sonnet Allegro USB 3.0 card in my MacPro 3,1 (2009+), that generally seems to work OK on its own, I found that the card interferes with trackpad Bluetooth operation severely. Does anyone have any work-arounds on this issue? I will have to return the card if it can't be fixed. I'm told that other cards similarly affect Bluetooth connected device operation and that they are not doing anything about fixing the problem as it is not their issue (does not affect operation of the USB 3.0 connected devices (even though it does produce bus interference in and of itself that in turn causes the problem). Harrumph, says I.


I haven't digested the Intel White Paper fully, but Intel suggest using Aluminum foil to mitigate the effect in some way. REALLY???


This is the image from their FAQ page on this.

Screen Shot 2013-06-05 at 16.26.27 .png


Sonnettech's site referred me to an Intel White Paper describing this issue and pointedly directed me to Apple about the interference problem they claim to be a known issue, here

Mac Pro, OS X Mountain Lion, (3,1) 10GB RAM, 500GB HD+250GB SSD