https://bugs.freedesktop.org/show_bug.cgi?id=103404
Bug ID: 103404 Summary: HDMI Audio with RX Vega not working on drm-next-4.15-dc (device listed as unconnected) Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: major Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: randomsalad@gmail.com
Created attachment 134990 --> https://bugs.freedesktop.org/attachment.cgi?id=134990&action=edit dmesg output filtered to show drm messages
When using a DC-patched kernel (the drm-next-4.15-dc branch to be specific), HDMI audio output on RX Vega does not work, as the device(s) are simply listed as unconnected.
Audio over DisplayPort works, but the second device (A 5.1 Surround Sound AV Receiver) does not register as an audio-output. It doesn't matter which port is used; All 4 physical monitor outputs (3 DisplayPorts, 1 HDMI), when connected to another device, be it the AV receiver or the monitor, fails to register any audio outputs. Only DisplayPort->DisplayPort works.
The attached dmesg log file shows both devices being connected and detected as audio outputs by drm, including the number of configurations available on each.