This issue appears to be an upstream bug, since you tested the latest upstream kernel. Would it be possible for you to open an upstream bug report[0]? That will allow the upstream Developers to examine the issue, and may provide a quicker resolution to the bug.
Please follow the instructions on the wiki page[0]. The first step is to email the appropriate mailing list. If no response is received, then a bug may be opened on bugzilla.kernel.org. Once this bug is reported upstream, please add the tag: 'kernel-bug- reported-upstream'. [0] https://wiki.ubuntu.com/Bugs/Upstream/kernel ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1460779 Title: NO HDMI Audio [Radeon HD 4000 series] Sound Status in linux package in Ubuntu: Incomplete Bug description: TV plugged in HDMI port Problem happens with Kernel versions 4 or above i try with all 4+ but didn't works. At the moment 4.1.0-040100rc2-generic but same issue. HDMI audio works if I select an older kernel (3.16.0-38 - 3.19.8-031908) tarjeta 1: HDMI [HDA ATI HDMI], dispositivo 3: HDMI 0 [HDMI 0] Subdispositivos: 1/1 Subdispositivo #0: subdevice #0 HDMI appears but don't sound. Description: Ubuntu 14.04.2 LTS Release: 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1460779/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
