I recently installed Ubuntu 16.04 (64-bit) alongside Windows 10 on my laptop. It picked up my Intel integrated graphics just fine, but my AMD graphics card does not appear at all in Additional Drivers. Although Ubuntu works fine without using my AMD card at all, I get pretty poor battery life. Any ideas how to fix this problem?
Additional info: My computer is a Toshiba L50-B025D with an AMD Radeon R7 M260 graphics card.