[Bug 199493] New: no audio over HDMI with amdgpu.dc=1 (on R9 380X)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199493

            Bug ID: 199493
           Summary: no audio over HDMI with amdgpu.dc=1 (on R9 380X)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.17.0-rc2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: haro41 at gmx.de
        Regression: No

Audio over HDMI doesn't work (no sound), if dc is enabled (amdgpu.dc=1).
Hardware is R9 380X (Tonga), i use ALSA only.

With dc disabled (amdgpu.dc=0), audio basically works, but i get 'noisy' sound
usually.

The only way to get correct audio over HDMI is currently:

disable dc (amdgpu.dc=0) and start windows once, then warm boot to linux.

It looks like: the windows driver is initializing the hardware correctly, while
amdgpu doesn't.

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