Bug 33399 - [RADEON:KMS:RV630:HDMI:AUDIO] no PCM mutichannel audio
Summary: [RADEON:KMS:RV630:HDMI:AUDIO] no PCM mutichannel audio
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: XOrg git
Hardware: All Linux (All)
: medium normal
Assignee: Default DRI bug account
QA Contact:
Depends on:
Reported: 2011-01-24 02:00 UTC by Xavier Bestel
Modified: 2015-07-14 07:28 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Xavier Bestel 2011-01-24 02:00:04 UTC

using a HD 2600, audio over HDMI is stereo-only. The only mean to have multichannel (e.g. 5.1) is to use passthrough, but true multichannel (e.g. 8 channels PCM) isn't supported by the driver, although it should be supported by the HDMI standard.

Here's the excerpt from alsa-info.sh concerning the card:
Codec: ATI R6xx HDMI
Address: 0
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x1002aa01
Subsystem Id: 0x00aa0100
Revision Id: 0x100000
No Modem Function Group found
Default PCM:
    rates [0x40]: 48000
    bits [0x2]: 16
    formats [0x1]: PCM
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
GPIO: io=0, o=0, i=0, unsolicited=0, wake=0
Node 0x02 [Audio Output] wcaps 0x201: Stereo Digital
  Control: name="IEC958 Playback Con Mask", index=0, device=0
  Control: name="IEC958 Playback Pro Mask", index=0, device=0
  Control: name="IEC958 Playback Default", index=0, device=0
  Control: name="IEC958 Playback Switch", index=0, device=0
  Device: name="HDMI 0", type="HDMI", device=3
  Converter: stream=1, channel=0
  Digital: Enabled GenLevel
  Digital category: 0x2
Node 0x03 [Pin Complex] wcaps 0x400381: Stereo Digital
  Pincap 0x00000094: OUT Detect HDMI
  Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Connection: 1

Full data is at http://www.alsa-project.org/db/?f=b3f67a0890f9878b7b3f345578e24eda0aaa59ac

Comment 1 Xavier Bestel 2011-09-21 08:19:25 UTC

could I have at least a hint to know if it's to be supported soon, or one day, or never ?

Comment 2 Andy Furniss 2011-09-21 09:59:04 UTC
(In reply to comment #1)
> Hi,
> could I have at least a hint to know if it's to be supported soon, or one day,
> or never ?
> Thanks,
>         Xav

I am not a dev - but nothing below 4000 series claims to support 7.1 in the specs on amd.com - so even if the driver gets support a 2600 may not be capable hardware wise.
Comment 3 Xavier Bestel 2011-09-22 01:02:14 UTC
Even 5.1 (without having to resort to passthrough) would be better than plain stereo.
Comment 4 Rafał Miłecki 2015-07-13 20:21:56 UTC
This is a very old report and this issue is likely to be fixed in the recent kernels. Could you try one, please?
There was support for multiple channels added.
Comment 5 Christian König 2015-07-14 07:28:44 UTC
Sorry I obviously have missed this bug.

The audio codec of the RV630 mentioned in this bug can only handle two channels, so the hardware simply doesn't support this.

Later hardware generations do support HDMI multichannel audio.

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