Comment # 31
on bug 101900
from Andrew Nelson
I have been running into the same issue. The problem seems to be that AMDGPU is
reporting that it supports 7 speakers instead of 8 in the EID. HBR formats work
with 5.1 encoded audio, but not 7.1. For some reason, the driver is configured
to subtract 1 from the channel count before passing it into the EID. I have
removed this and confirmed that 7.1 HBR audio works. Patch below:
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
b/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
index 8bfb4577b4d5..5dcc685a1379 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
@@ -557,7 +557,7 @@ void dce_aud_az_configure(
/* fill audio format data */
set_reg_field_value(value,
- audio_mode->channel_count - 1,
+ audio_mode->channel_count,
AZALIA_F0_CODEC_PIN_CONTROL_AUDIO_DESCRIPTOR0,
MAX_CHANNELS);
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