[alsa-devel] Problems with the DP MST audio support patchset
Yang, Libin
libin.yang at intel.com
Fri May 26 06:56:17 CEST 2017
Hi Michael,
>-----Original Message-----
>From: Michael Forney [mailto:mforney at mforney.org]
>Sent: Friday, May 26, 2017 12:10 PM
>To: Yang, Libin <libin.yang at intel.com>
>Cc: Libin Yang <libin.yang at linux.intel.com>; alsa-devel at alsa-project.org;
>Pascal Wichmann <pascal.wichmann at pa-w.de>
>Subject: Re: [alsa-devel] Problems with the DP MST audio support patchset
>
>On Thu, May 25, 2017 at 1:21 AM, Michael Forney <mforney at mforney.org>
>wrote:
>> Hi,
>>
>> I recently updated my kernel to 4.11, and am experiencing similar
>> problems as Pascal. I have a Skylake processor and DP output hooked up
>> with a DP to HDMI cable to an Onkyo SR-606 receiver.
>>
>> I can't get audio to work at all through my receiver anymore. I tried
>> both DTS and PCM audio files. I bisected it to the above mentioned
>> commit 9152085defb6426ce8f9989ca27e4450daefbd89 (ALSA: hda - add DP
>> MST audio support).
>>
>>>> Do you know if the DP MST audio mode is used in your case?
>>
>> I don't know what DP MST is or how to tell if I'm using it. However, I
>> noticed that when it does work, `aplay -L` gives me
>>
>> hdmi:CARD=PCH,DEV=0
>> HDA Intel PCH, HDMI 0
>> HDMI Audio Output
>> hdmi:CARD=PCH,DEV=1
>> HDA Intel PCH, HDMI 1
>> HDMI Audio Output
>>
>> and when it doesn't, I get
>>
>> hdmi:CARD=PCH,DEV=0
>> HDA Intel PCH, Generic Digital
>> HDMI Audio Output
>
>Well, I noticed in my dmesg log for 4.11:
>
><4>[ 1.201789] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.201790] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><4>[ 1.201792] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.201794] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><4>[ 1.201795] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.201797] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><3>[ 1.202668] snd_hda_intel 0000:00:1f.3: control 3:0:0:ELD:0 is
>already present
><4>[ 1.202737] snd_hda_codec_hdmi: probe of hdaudioC0D2 failed with
>error -16
><4>[ 1.204335] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.204337] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><4>[ 1.204338] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.204340] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><4>[ 1.204341] snd_hda_intel 0000:00:1f.3: Too many HDMI devices
><4>[ 1.204343] snd_hda_intel 0000:00:1f.3: Consider building the
>kernel with CONFIG_SND_DYNAMIC_MINORS=y
><3>[ 1.205412] snd_hda_intel 0000:00:1f.3: control 3:0:0:ELD:0 is
>already present
><4>[ 1.205464] snd_hda_codec_hdmi: probe of hdaudioC0D2 failed with
>error -16
><6>[ 1.205644] snd_hda_codec_generic hdaudioC0D2: ignore pin 0x7,
>too many assigned pins
><6>[ 1.205648] snd_hda_codec_generic hdaudioC0D2: autoconfig for
>Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line
><6>[ 1.205651] snd_hda_codec_generic hdaudioC0D2: speaker_outs=0
>(0x0/0x0/0x0/0x0/0x0)
><6>[ 1.205653] snd_hda_codec_generic hdaudioC0D2: hp_outs=0
>(0x0/0x0/0x0/0x0/0x0)
><6>[ 1.205655] snd_hda_codec_generic hdaudioC0D2: mono:
>mono_out=0x0
><6>[ 1.205656] snd_hda_codec_generic hdaudioC0D2: dig-out=0x5/0x6
><6>[ 1.205658] snd_hda_codec_generic hdaudioC0D2: inputs:
><6>[ 1.207882] input: HDA Intel PCH Mic as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input4
><6>[ 1.207979] input: HDA Intel PCH Front Headphone as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input5
><6>[ 1.208070] input: HDA Intel PCH HDMI/DP,pcm=3 as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input6
><6>[ 1.208158] input: HDA Intel PCH HDMI/DP,pcm=7 as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input7
><6>[ 1.208246] input: HDA Intel PCH HDMI/DP as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input8
><6>[ 1.208335] input: HDA Intel PCH HDMI/DP as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input9
><6>[ 1.208441] input: HDA Intel PCH HDMI as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input12
><6>[ 1.208582] input: HDA Intel PCH HDMI as
>/devices/pci0000:00/0000:00:1f.3/sound/card0/input13
><4>[ 1.208700] ------------[ cut here ]------------
><4>[ 1.208708] WARNING: CPU: 0 PID: 43 at fs/proc/generic.c:346
>proc_register+0xe9/0x110
><4>[ 1.208709] proc_dir_entry 'card0/eld#2.0' already registered
><4>[ 1.208710] Modules linked in:
><4>[ 1.208715] CPU: 0 PID: 43 Comm: kworker/0:1 Not tainted 4.11.3+ #41
><4>[ 1.208716] Hardware name: HP HP EliteDesk 800 G2 DM 35W/8055,
>BIOS N21 Ver. 02.14 04/28/2016
><4>[ 1.208721] Workqueue: events azx_probe_work
><4>[ 1.208723] Call Trace:
><4>[ 1.208729] dump_stack+0x4d/0x66
><4>[ 1.208733] __warn+0xc6/0xe0
><4>[ 1.208737] warn_slowpath_fmt+0x46/0x50
><4>[ 1.208742] proc_register+0xe9/0x110
><4>[ 1.208746] proc_create_data+0x71/0xc0
><4>[ 1.208750] snd_info_register+0x66/0xd0
><4>[ 1.208753] snd_info_register_recursive+0x5b/0x70
><4>[ 1.208756] snd_info_register_recursive+0x46/0x70
><4>[ 1.208759] snd_info_card_register+0x25/0xa0
><4>[ 1.208764] snd_card_register+0x140/0x190
><4>[ 1.208769] ? device_attach+0xb/0x10
><4>[ 1.208773] ? snd_hda_codec_configure+0xb1/0x120
><4>[ 1.208776] azx_probe_work+0x47d/0x860
><4>[ 1.208778] ? azx_probe_work+0x47d/0x860
><4>[ 1.208783] process_one_work+0x1ec/0x480
><4>[ 1.208787] worker_thread+0x43/0x4d0
><4>[ 1.208790] kthread+0x104/0x140
><4>[ 1.208794] ? process_one_work+0x480/0x480
><4>[ 1.208797] ? kthread_create_on_node+0x40/0x40
><4>[ 1.208802] ret_from_fork+0x29/0x40
><4>[ 1.208805] ---[ end trace 538d7309f1b9646f ]---
>
>So I added CONFIG_SND_DYNAMIC_MINORS=y as suggested (previously it was
>disabled based on the help text). That seemed to do the trick.
So the audio works well?
>However, the `proc_dir_entry 'card0/eld#2.0' already registered` warning
>seems like it could be a bug despite this.
>
>I guess the problem was this new MST feature means that now I have 5 HDMI
>outputs showing up, which is too many.
Yes, in dynamic mode, there are 5 HDMI/DP outputs for the compatibility
with pulseaudio.
Regards,
Libin
>
>Sorry for the noise.
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