darkregs Posted December 28, 2014 Share Posted December 28, 2014 Toshiba L635, Detect ATI RADEON HD 5470 - 512 Vram normally on windows when i connect to HDMI, i choose Extend option. when i on Yosemite plug HDMI my laptop only Mirror (Duplicate), Tab Arrangement not show,only say "...you only have single display attach...." any help... Thanks A Lot Quote Link to comment Share on other sites More sharing options...