Allen&Heath Qu-16 crunchy audio

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geoffrey
Established Member
Posts: 81
Joined: Mon Jul 30, 2018 2:08 am

Allen&Heath Qu-16 crunchy audio

Post by geoffrey »

Hi all,

I've got an Allen&Heath Qu-16 mixer which has a 24x22 USB audio interface, but audio playback from Linux was intermittently crunchy (every few minutes, the audio would slowly get distorted then slowly go back to normal). It sounded like a similar problem to that discussed here: viewtopic.php?f=6&t=21163 and I found mention of an implicit feedback endpoint in "lsusb -v":

Code: Select all

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              8 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x00
        bFormatType             1
        bmFormats         0x00000001
          PCM
        bNrChannels            24
        bmChannelConfig   0x80000000
        iChannelNames          50 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x02a0  1x 672 bytes
        bInterval               1
        AudioControl Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         2 Decoded PCM samples
          wLockDelay              8
so I applied this patch:

Code: Select all

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 2850641..8e1e3ea 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -336,6 +336,7 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
        switch (subs->stream->chip->usb_id) {
        case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
        case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
+       case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
                ep = 0x81;
                ifnum = 3;
                goto add_sync_ep_from_ifnum;
and the audio seems good now to me.

Anyone else have one of these mixers (or the other similar models, Qu-24, Qu-32, Qu-SB or Qu-Pac) and can confirm the issue and this solution?

Thanks,
Geoffrey.

fraslo
Established Member
Posts: 39
Joined: Sun Jun 28, 2015 2:51 pm

Re: Allen&Heath Qu-16 crunchy audio

Post by fraslo »

Hi,

I have a similar problem with my built in class compliant audio interface (Yamaha MODX Keyboard 10out/4in/44100): after a few minutes the audio gets distorted, the problem vanishes sometimes after a few minutes. I tried different cables, USB ports and a lot of configuration options. There are no XRUNS and when I record the output there are also no crackles.

Is there any chance that these problems are related?

Any help is appreciated, lsusb -v shows this:

Code: Select all

Bus 002 Device 008: ID 0499:172a Yamaha Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x0499 Yamaha Corp.
  idProduct          0x172a
  bcdDevice            1.00
  iManufacturer           1
  iProduct                2
  iSerial                 0
  bNumConfigurations      2
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x015d
    bNumInterfaces          4
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         4
      bFunctionClass          1 Audio
      bFunctionSubClass       0
      bFunctionProtocol      32
      iFunction               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32
      iInterface              0
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x004b
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID                1
        bmAttributes            3 Internal programmable clock
        bmControls           0x03
          Clock Frequency Control (read/write)
        bAssocTerminal          0
        iClockSource            0
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID              1
        bNrChannels             4
        bmChannelConfig    0x00000000
        iChannelNames          16
        bmControls         0x0000
        iTerminal               0
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0603 Line Connector
        bAssocTerminal          0
        bSourceID               2
        bCSourceID              1
        bmControls         0x0000
        iTerminal               0
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0603 Line Connector
        bAssocTerminal          0
        bCSourceID              1
        bNrChannels            10
        bmChannelConfig    0x00000000
        iChannelNames          48
        bmControls         0x0000
        iTerminal               0
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             5
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               4
        bCSourceID              1
        bmControls         0x0000
        iTerminal               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32
      iInterface              0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32
      iInterface              0
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             4
        bmChannelConfig    0x00000000
        iChannelNames          16
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x07  EP 7 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x004e  1x 78 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32
      iInterface              0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32
      iInterface              0
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           5
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            10
        bmChannelConfig    0x00000000
        iChannelNames          48
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x00c3  1x 195 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0
      iInterface              0
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0081
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 2
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 3
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                33
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                34
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                35
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                65
        bNrInputPins            1
        baSourceID( 0)         33
        BaSourcePin( 0)         1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                66
        bNrInputPins            1
        baSourceID( 0)         34
        BaSourcePin( 0)         1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                67
        bNrInputPins            1
        baSourceID( 0)         35
        BaSourcePin( 0)         1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                97
        bNrInputPins            1
        baSourceID( 0)          1
        BaSourcePin( 0)         1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                98
        bNrInputPins            1
        baSourceID( 0)          2
        BaSourcePin( 0)         1
        iJack                   0
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                99
        bNrInputPins            1
        baSourceID( 0)          3
        BaSourcePin( 0)         1
        iJack                   0
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 7
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         3
          baAssocJackID( 0)      33
          baAssocJackID( 1)      34
          baAssocJackID( 2)      35
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 7
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         3
          baAssocJackID( 0)      97
          baAssocJackID( 1)      98
          baAssocJackID( 2)      99
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0122
    bNumInterfaces          5
    bConfigurationValue     2
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      1
      bInterfaceProtocol      0
      iInterface              0
      ** UNRECOGNIZED:  0a 24 01 00 01 34 00 02 01 02
      ** UNRECOGNIZED:  0c 24 02 01 01 01 00 02 03 00 00 00
      ** UNRECOGNIZED:  09 24 03 02 01 03 00 01 00
      ** UNRECOGNIZED:  0c 24 02 03 03 06 00 02 03 00 00 00
      ** UNRECOGNIZED:  09 24 03 04 01 01 00 03 00
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      2
      bInterfaceProtocol      0
      iInterface              0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      2
      bInterfaceProtocol      0
      iInterface              0
      ** UNRECOGNIZED:  07 24 01 01 01 01 00
      ** UNRECOGNIZED:  0b 24 02 01 04 03 18 01 44 ac 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x07  EP 7 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x004e  1x 78 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      2
      bInterfaceProtocol      0
      iInterface              0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      2
      bInterfaceProtocol      0
      iInterface              0
      ** UNRECOGNIZED:  07 24 01 04 01 01 00
      ** UNRECOGNIZED:  0b 24 02 01 0a 03 18 01 44 ac 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x00c3  1x 195 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      3
      bInterfaceProtocol    255
      iInterface              0
      ** UNRECOGNIZED:  07 24 01 00 01 42 00
      ** UNRECOGNIZED:  06 24 02 02 01 00
      ** UNRECOGNIZED:  06 24 02 02 02 00
      ** UNRECOGNIZED:  06 24 02 02 03 00
      ** UNRECOGNIZED:  09 24 03 02 01 01 01 01 00
      ** UNRECOGNIZED:  09 24 03 02 02 01 01 01 00
      ** UNRECOGNIZED:  09 24 03 02 03 01 01 01 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      ** UNRECOGNIZED:  07 24 01 00 01 24 00
      ** UNRECOGNIZED:  06 24 02 02 01 00
      ** UNRECOGNIZED:  09 24 03 02 01 01 01 01 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0

geoffrey
Established Member
Posts: 81
Joined: Mon Jul 30, 2018 2:08 am

Re: Allen&Heath Qu-16 crunchy audio

Post by geoffrey »

fraslo wrote:
Fri Oct 30, 2020 2:35 pm
Hi,

I have a similar problem with my built in class compliant audio interface (Yamaha MODX Keyboard 10out/4in/44100): after a few minutes the audio gets distorted, the problem vanishes sometimes after a few minutes. I tried different cables, USB ports and a lot of configuration options. There are no XRUNS and when I record the output there are also no crackles.

Is there any chance that these problems are related?
Hi Frasio,

I'm no expert, but it sounds like the same thing to me. Try applying this patch to pcm.c and let me know if it works for you:

Code: Select all

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 28506415c7ad..91afc3dd7b99 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -345,6 +345,7 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
                ifnum = 2;
                goto add_sync_ep_from_ifnum;
        case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
+       case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
                ep = 0x86;
                ifnum = 2;
                goto add_sync_ep_from_ifnum;
Regards,
Geoffrey.

fraslo
Established Member
Posts: 39
Joined: Sun Jun 28, 2015 2:51 pm

Re: Allen&Heath Qu-16 crunchy audio

Post by fraslo »

Hi Geoffrey,

thank you so much for looking into my problem. I didn't compile a kernel for the last 15 years or so. I hope it is all right to add just the last four lines at the correct position. Compiling right now.

Thanks again

User avatar
bluebell
Established Member
Posts: 1464
Joined: Sat Sep 15, 2012 11:44 am
Location: Saarland & Frankfurt, Germany

Re: Allen&Heath Qu-16 crunchy audio

Post by bluebell »

fraslo wrote:
Sun Nov 01, 2020 3:49 pm
Hi Geoffrey,

thank you so much for looking into my problem. I didn't compile a kernel for the last 15 years or so. I hope it is all right to add just the last four lines at the correct position. Compiling right now.

Thanks again
Only the one line with + at the beginning is enough.
Linux – MOTU UltraLite AVB – Qtractor – https://soundcloud.com/suedwestlicht

fraslo
Established Member
Posts: 39
Joined: Sun Jun 28, 2015 2:51 pm

Re: Allen&Heath Qu-16 crunchy audio

Post by fraslo »

Hi Geoffrey and bluebell,

It works! I stressed my system for several hours and the problem did not occur. Without the patch there was this crackling after a few minutes by simply listening to an audio stream. I was able to record all 10 analog channels for over 20 minutes without any problems. No crackling, distortion or XRUNs (44100/256/2).
Is it possible to add this patch into the Linux kernel? How should I proceed?

Thanks so much for all of your help, I can't tell how relieved I am that the audio interface works properly now.

Frank

geoffrey
Established Member
Posts: 81
Joined: Mon Jul 30, 2018 2:08 am

Re: Allen&Heath Qu-16 crunchy audio

Post by geoffrey »

fraslo wrote:
Mon Nov 02, 2020 3:47 pm
Hi Geoffrey and bluebell,

It works! I stressed my system for several hours and the problem did not occur. Without the patch there was this crackling after a few minutes by simply listening to an audio stream. I was able to record all 10 analog channels for over 20 minutes without any problems. No crackling, distortion or XRUNs (44100/256/2).
Is it possible to add this patch into the Linux kernel? How should I proceed?

Thanks so much for all of your help, I can't tell how relieved I am that the audio interface works properly now.

Frank
Hi Frank,

That's great news! I've sent you a private message about getting the patch into the kernel.

Regards,
Geoffrey.

geoffrey
Established Member
Posts: 81
Joined: Mon Jul 30, 2018 2:08 am

Re: Allen&Heath Qu-16 crunchy audio

Post by geoffrey »

FYI all, I submitted the Qu-16 and MODX patches above and they are now in the Linux kernel since 5.10-rc3, 5.9.7, 5.4.76, and 4.19.156.

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