After updating the BIOS and the Linux Kernel, the issue stays completely the same. So, I am trying to mark this report Status 'Confirmed'.
# dmidecode -t 0 | grep -E 'BIOS Information|Vendor|Version|Release' BIOS Information Vendor: American Megatrends Inc. Version: 2603 Release Date: 06/26/2015 # uname -r 4.3.0-040300rc5-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1504227 Title: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1504227/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs