[alsa-devel] Missing surround channels with Nvidia HDMI & snd-hda-intel driver

[Takashi Iwai]

On Mon, 13 Nov 2017 18:18:39 +0100,
VDR User wrote:
> 
> Hi Takashi,
> 
> Thanks for your reply. I have no clue unfortunately as I just noticed
> it now. Is there a previous kernel you could recommend I try prior to
> any or big changes to how snd-hda-intel works?

Well, nothing I can think of for now, that's why I asked about testing
the older kernel.  I'd do a bisection, e.g. try stable kernels like
4.4.x or 4.9.x, depending on the "previously working" version you
remember, then go to the middle between them if it hits the
regression.


Takashi

> 
> -Derek
> 
> On Mon, Nov 13, 2017 at 8:40 AM, Takashi Iwai <tiwai at suse.de> wrote:
> > On Sun, 12 Nov 2017 19:01:14 +0100,
> > VDR User wrote:
> >>
> >> Hi. I just noticed that I'm missing some surround channels and I think
> >> it may be a bug in the alsa drivers because my current setup used to
> >> work just fine.
> >
> > If it's a regression, which kernel did work and which started a
> > regression?  This alone would be a good help for tracking down the
> > problem.
> >
> >
> > Takashi
> >
> >> I'm running Debian Testing, stable kernel 4.13.12,
> >> alsa-utils 1.1.3-1. My ~/.asoundrc is:
> >>
> >> ~$ cat .asoundrc
> >> pcm.!default "hdmi:NVidia,1"
> >> ~$
> >>
> >> I am not setting anything on my kernel load line:
> >>
> >>         echo    'Loading Linux 4.13.12-amd ...'
> >>         linux   /vmlinuz-4.13.12-amd
> >> root=UUID=6df5733d-b089-450c-9ec6-661dd013c7c0 ro
> >>         echo    'Loading initial ramdisk ...'
> >>         initrd  /initrd.img-4.13.12-amd
> >>
> >> The driver being used is snd-hda-intel with an Nvidia GT520 video
> >> card. And lastly I do not have Pulse or a desktop environment. This is
> >> a minimal HTPC setup that runs only an xserver to provide video
> >> output, with audio/video being sent to my surround receiver via HDMI.
> >>
> >> The first thing I noticed was mpv-player was downmixing 5.1 to 3.1 and
> >> giving the following log message:
> >>
> >> [ao/alsa] trying to set ALSA channel map: FL FR FC LFE RL RR
> >> [ao/alsa] channel map reported by ALSA: FL FR FC LFE UNKNOWN UNKNOWN
> >> [ao/alsa] which we understand as: fl-fr-fc-lfe-na-na
> >> [ao/alsa] using the ALSA channel map.
> >> [ao/alsa] hw pausing supported: yes
> >> [ao/alsa] buffersize: 2720 samples
> >> [ao/alsa] period size: 160 samples
> >> [ao/alsa] device buffer: 2720 samples.
> >> [ao/alsa] using soft-buffer of 8820 samples.
> >> [cplayer] AO: [alsa] 44100Hz fl-fr-fc-lfe-na-na (3.1) 6ch s32
> >> [cplayer] AO: Description: ALSA audio output
> >> [af] Adding filter lavrresample
> >> [lavrresample] Remix: 5.1 -> 3.1
> >> [af] Audio filter chain:
> >> [af]   [in] 44100Hz 5.1 6ch floatp
> >> [af]   [lavrresample] 44100Hz fl-fr-fc-lfe-na-na (3.1) 6ch s32 [a]
> >> [af]   [out] 44100Hz fl-fr-fc-lfe-na-na (3.1) 6ch s32
> >> [af]   [ao] 44100Hz fl-fr-fc-lfe-na-na (3.1) 6ch s32
> >>
> >> That makes it look like Rear Left/Right channels are absent. I think
> >> ran speaker-test. 4 and 5 show as "Unknown" but correctly audibly
> >> announced as "front center" and "subwoofer" respectively:
> >>
> >> ~$ speaker-test -c 6 -t wav
> >>
> >> speaker-test 1.1.3
> >>
> >> Playback device is default
> >> Stream parameters are 48000Hz, S16_LE, 6 channels
> >> WAV file(s)
> >> Rate set to 48000Hz (requested 48000Hz)
> >> Buffer size range from 64 to 5440
> >> Period size range from 32 to 2720
> >> Using max buffer size 5440
> >> Periods = 4
> >> was set period_size = 1088
> >> was set buffer_size = 5440
> >>  0 - Front Left
> >>  1 - Front Right
> >>  3 - Rear Right
> >>  2 - Rear Left
> >>  4 - Unknown
> >>  5 - Unknown
> >>
> >> Additional information that may be of use:
> >>
> >> ~$ aplay -l
> >> **** List of PLAYBACK Hardware Devices ****
> >> card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
> >>   Subdevices: 1/1
> >>   Subdevice #0: subdevice #0
> >> card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
> >>   Subdevices: 0/1
> >>   Subdevice #0: subdevice #0
> >>
> >> ~$ cat /proc/asound/card1/eld#0.1
> >> monitor_present         1
> >> eld_valid               1
> >> monitor_name            SONY AVAMP
> >>
> >> connection_type         HDMI
> >> eld_version             [0x2] CEA-861D or below
> >> edid_version            [0x3] CEA-861-B, C or D
> >> manufacture_id          0xd94d
> >> product_id              0xf02
> >> port_id                 0x200
> >> support_hdcp            0
> >> support_ai              0
> >> audio_sync_delay        0
> >> speakers                [0x5f] FL/FR LFE FC RL/RR RC RLC/RRC
> >> sad_count               12
> >> sad0_coding_type        [0xc] MLP (Dolby TrueHD)
> >> sad0_channels           2
> >> sad0_rates              [0x1ec0] 44100 48000 88200 96000 176400 192000
> >> sad1_coding_type        [0xc] MLP (Dolby TrueHD)
> >> sad1_channels           6
> >> sad1_rates              [0x1ec0] 44100 48000 88200 96000 176400 192000
> >> sad2_coding_type        [0xc] MLP (Dolby TrueHD)
> >> sad2_channels           8
> >> sad2_rates              [0x6c0] 44100 48000 88200 96000
> >> sad3_coding_type        [0xb] DTS-HD
> >> sad3_channels           2
> >> sad3_rates              [0x1ec0] 44100 48000 88200 96000 176400 192000
> >> sad4_coding_type        [0xb] DTS-HD
> >> sad4_channels           6
> >> sad4_rates              [0x1ec0] 44100 48000 88200 96000 176400 192000
> >> sad5_coding_type        [0xb] DTS-HD
> >> sad5_channels           8
> >> sad5_rates              [0x6c0] 44100 48000 88200 96000
> >> sad6_coding_type        [0x1] LPCM
> >> sad6_channels           2
> >> sad6_rates              [0x1ee0] 32000 44100 48000 88200 96000 176400 192000
> >> sad6_bits               [0xe0000] 16 20 24
> >> sad7_coding_type        [0x1] LPCM
> >> sad7_channels           6
> >> sad7_rates              [0x1ee0] 32000 44100 48000 88200 96000 176400 192000
> >> sad7_bits               [0xe0000] 16 20 24
> >> sad8_coding_type        [0x1] LPCM
> >> sad8_channels           8
> >> sad8_rates              [0x1ee0] 32000 44100 48000 88200 96000 176400 192000
> >> sad8_bits               [0xe0000] 16 20 24
> >> sad9_coding_type        [0x2] AC-3
> >> sad9_channels           6
> >> sad9_rates              [0xe0] 32000 44100 48000
> >> sad9_max_bitrate        680000
> >> sad10_coding_type       [0x7] DTS
> >> sad10_channels          6
> >> sad10_rates             [0x6e0] 32000 44100 48000 88200 96000
> >> sad10_max_bitrate       1536000
> >> sad11_coding_type       [0xa] E-AC-3/DD+ (Dolby Digital Plus)
> >> sad11_channels          8
> >> sad11_rates             [0xc0] 44100 48000
> >>
> >> 02:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce
> >> GT 520] (rev a1) (prog-if 00 [VGA controller])
> >>         Subsystem: eVga.com. Corp. GF119 [GeForce GT 520]
> >>         Flags: bus master, fast devsel, latency 0, IRQ 25
> >>         Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
> >>         Memory at f0000000 (64-bit, prefetchable) [size=128M]
> >>         Memory at fa000000 (64-bit, prefetchable) [size=32M]
> >>         I/O ports at ec00 [size=128]
> >>         [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
> >>         Capabilities: <access denied>
> >>         Kernel driver in use: nvidia
> >>         Kernel modules: nvidia
> >>
> >> 02:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1)
> >>         Subsystem: eVga.com. Corp. GF119 HDMI Audio Controller
> >>         Flags: bus master, fast devsel, latency 0, IRQ 17
> >>         Memory at fea7c000 (32-bit, non-prefetchable) [size=16K]
> >>         Capabilities: <access denied>
> >>         Kernel driver in use: snd_hda_intel
> >>         Kernel modules: snd_hda_intel
> >> _______________________________________________
> >> Alsa-devel mailing list
> >> Alsa-devel at alsa-project.org
> >> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>
>