Chipmaker Qualcomm Inc said on Thursday it was asked to refund Canada’s BlackBerry Ltd $814.9 million within an arbitration over royalties for several past sales. U.S.-posted stocks of BlackBerry were up 17.8 percent at $9.07 in heavy trading, while these were also up 17 percent at C$12.03 in Toronto. Qualcomm’s stocks were down about 2 […]