This fix is also needed for stable kernels (5.4+). The bug exists since the legacy DCE audio path was introduced and affects users on LTS 5.4 kernels with AMD Southern Islands / CIK / VI GPUs connected to displays without audio support.
Could you please add the following line when applying? Cc: [email protected] # 5.4+ Thanks. At 2026-11-02 17:49:29, [email protected] wrote: >From: renpanpan <[email protected]> > >The amdgpu legacy DCE audio path (dce_v6/v8/v10) unconditionally calls >audio_enable(pin, true) at the end of afmt_setmode(), regardless of >whether the connected display advertises audio support in its EDID. > >This causes a phantom HDMI audio output to appear for displays that >have no audio capability (no basic audio bit, no Audio Data Block in >EDID), because the GPU sets the AUDIO_ENABLED register bit, which >drives the HDA codec's ELDV pin sense, making the codec report the >jack as audio-available. > >The radeon, nouveau, and dw-hdmi drivers all gate audio enablement on >display_info.has_audio. Apply the same check to amdgpu's DCE >afmt_setmode functions. > >Signed-off-by: renpanpan <[email protected]> >--- > drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 5 +++-- > drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 5 +++-- > drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 5 +++-- > 3 files changed, 9 insertions(+), 6 deletions(-) > >diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c >b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c >index f2977fe6d824..04b18056a906 100644 >--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c >+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c >@@ -1705,8 +1705,9 @@ static void dce_v10_0_afmt_setmode(struct drm_encoder >*encoder, > WREG32(mmAFMT_RAMP_CONTROL2 + dig->afmt->offset, 0x00000001); > WREG32(mmAFMT_RAMP_CONTROL3 + dig->afmt->offset, 0x00000001); > >- /* enable audio after to setting up hw */ >- dce_v10_0_audio_enable(adev, dig->afmt->pin, true); >+ /* Only enable audio if the display supports it */ >+ if (connector->display_info.has_audio) >+ dce_v10_0_audio_enable(adev, dig->afmt->pin, true); > } > > static void dce_v10_0_afmt_enable(struct drm_encoder *encoder, bool enable) >diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c >b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c >index c68de0fe1d7d..585b0a50279f 100644 >--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c >+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c >@@ -1748,8 +1748,9 @@ static void dce_v6_0_afmt_setmode(struct drm_encoder >*encoder, > dce_v6_0_audio_dp_enable(encoder, 1); > } > >- /* enable audio after setting up hw */ >- dce_v6_0_audio_enable(adev, dig->afmt->pin, true); >+ /* Only enable audio if the display supports it */ >+ if (connector->display_info.has_audio) >+ dce_v6_0_audio_enable(adev, dig->afmt->pin, true); > } > > static void dce_v6_0_afmt_enable(struct drm_encoder *encoder, bool enable) >diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c >b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c >index c3906270f25e..1390efa4ea51 100644 >--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c >+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c >@@ -1653,8 +1653,9 @@ static void dce_v8_0_afmt_setmode(struct drm_encoder >*encoder, > WREG32(mmAFMT_RAMP_CONTROL2 + offset, 0x00000001); > WREG32(mmAFMT_RAMP_CONTROL3 + offset, 0x00000001); > >- /* enable audio after setting up hw */ >- dce_v8_0_audio_enable(adev, dig->afmt->pin, true); >+ /* Only enable audio if the display supports it */ >+ if (connector->display_info.has_audio) >+ dce_v8_0_audio_enable(adev, dig->afmt->pin, true); > } > > static void dce_v8_0_afmt_enable(struct drm_encoder *encoder, bool enable) >-- >2.43.0
