Re: 2.6.15 USB-Audio produces loud noise

From: Lee Revell
Date: Thu Jan 05 2006 - 17:34:30 EST

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In reply to: Edgar Toernig: "2.6.15 USB-Audio produces loud noise"
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[added alsa-devel to cc]

On Wed, 2006-01-04 at 20:53 +0100, Edgar Toernig wrote:
> Hi,
>
> my USB-speakers only work sporadical with 2.6.15. Sometimes everything's
> fine, sometimes they only produces loud noise as if the low and high bytes
> are swapped or the samples are not properly aligned. With 2.6.13 I never
> had this problem.
>
> This occures either with alsaplayer or with OSS apps using the kernel
> OSS emulation. Furthermore, it seems to be a startup problem. If
> playback starts correct it stays correct, if it starts wrong it stays
> wrong - at least as long as it keeps streaming. If playback is paused,
> the problem may trigger again.
>
> I tried UP, SMP (P4-HT), gcc-2.95, gcc-3.3.5 - no change. All drivers
> build in.
>
> [dmesg, lspci, and lsusb output below]
>
> Any fix known? I had a short look at the 2.6.13->15 diffs of usbaudio.c
> but they are rather big and I don't even know whether it's an USB or an
> Alsa problem...
>
> Ciao, ET.
>
>
> dmesg: (stripped)
>
> ACPI: PCI Interrupt 0000:00:13.0[A] -> GSI 19 (level, low) -> IRQ 18
> ohci_hcd 0000:00:13.0: OHCI Host Controller
> drivers/usb/core/inode.c: creating file '002'
> ohci_hcd 0000:00:13.0: new USB bus registered, assigned bus number 2
> ohci_hcd 0000:00:13.0: irq 18, io mem 0xec304000
> ohci_hcd 0000:00:13.0: resetting from state 'reset', control = 0x0
> ohci_hcd 0000:00:13.0: OHCI controller state
> ohci_hcd 0000:00:13.0: OHCI 1.0, NO legacy support registers
> ohci_hcd 0000:00:13.0: control 0x083 HCFS=operational CBSR=3
> ohci_hcd 0000:00:13.0: cmdstatus 0x00000 SOC=0
> ohci_hcd 0000:00:13.0: intrstatus 0x00000044 RHSC SF
> ohci_hcd 0000:00:13.0: intrenable 0x8000001a MIE UE RD WDH
> ohci_hcd 0000:00:13.0: hcca frame #0005
> ohci_hcd 0000:00:13.0: roothub.a 02000203 POTPGT=2 NPS NDP=3(3)
> ohci_hcd 0000:00:13.0: roothub.b 00000000 PPCM=0000 DR=0000
> ohci_hcd 0000:00:13.0: roothub.status 00008000 DRWE
> ohci_hcd 0000:00:13.0: roothub.status 00008000 DRWE
> ohci_hcd 0000:00:13.0: roothub.portstatus [0] 0x00010100 CSC PPS
> ohci_hcd 0000:00:13.0: roothub.portstatus [1] 0x00000100 PPS
> ohci_hcd 0000:00:13.0: roothub.portstatus [2] 0x00000100 PPS
> ohci_hcd 0000:00:13.0: created debug files
> usb usb2: default language 0x0409
> usb usb2: new device strings: Mfr=3, Product=2, SerialNumber=1
> usb usb2: Product: OHCI Host Controller
> usb usb2: Manufacturer: Linux 2.6.15 ohci_hcd
> usb usb2: SerialNumber: 0000:00:13.0
> usb usb2: hotplug
> usb usb2: adding 2-0:1.0 (config #1, interface 0)
> usb 2-0:1.0: hotplug
> hub 2-0:1.0: usb_probe_interface
> hub 2-0:1.0: usb_probe_interface - got id
> hub 2-0:1.0: USB hub found
> hub 2-0:1.0: 3 ports detected
> hub 2-0:1.0: standalone hub
> hub 2-0:1.0: no power switching (usb 1.0)
> hub 2-0:1.0: global over-current protection
> hub 2-0:1.0: power on to power good time: 4ms
> hub 2-0:1.0: local power source is good
> hub 2-0:1.0: no over-current condition exists
> hub 2-0:1.0: global over-current protection
> hub 2-0:1.0: power on to power good time: 4ms
> hub 2-0:1.0: local power source is good
> hub 2-0:1.0: no over-current condition exists
> hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
> ohci_hcd 0000:00:13.0: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PE
> S CCS
> usb 2-1: new full speed USB device using ohci_hcd and address 2
> ohci_hcd 0000:00:13.0: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PE
> S CCS
> usb 2-1: ep0 maxpacket = 8
> usb 2-1: skipped 4 descriptors after interface
> usb 2-1: skipped 2 descriptors after interface
> usb 2-1: skipped 1 descriptor after endpoint
> usb 2-1: default language 0x0409
> usb 2-1: new device strings: Mfr=1, Product=2, SerialNumber=0
> usb 2-1: Product: USB Audio
> usb 2-1: Manufacturer: C-Media INC.
> usb 2-1: hotplug
> usb 2-1: adding 2-1:1.0 (config #1, interface 0)
> usb 2-1:1.0: hotplug
> usb 2-1: adding 2-1:1.1 (config #1, interface 1)
> usb 2-1:1.1: hotplug
> drivers/usb/core/inode.c: creating file '002'
> Advanced Linux Sound Architecture Driver Version 1.0.10rc3 (Mon Nov 07 13:30:21
> 2005 UTC).
> ACPI: PCI Interrupt 0000:00:14.5[B] -> GSI 17 (level, low) -> IRQ 17
> snd-usb-audio 2-1:1.0: usb_probe_interface
> snd-usb-audio 2-1:1.0: usb_probe_interface - got id
> usbcore: registered new driver snd-usb-audio
> ALSA device list:
> #0: ATI IXP rev 0 with ALC650F at 0xec305000, irq 17
> #1: C-Media INC. USB Audio at usb-0000:00:13.0-1, full speed
>
>
> lspci:
>
> 0000:00:13.0 USB Controller: ATI Technologies Inc OHCI USB Controller #1 (rev 01) (prog-if 10 [OHCI])
> Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer: Unknown device f362
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
> Status: Cap- 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
> Latency: 64, cache line size 20
> Interrupt: pin A routed to IRQ 18
> Region 0: Memory at ec304000 (32-bit, non-prefetchable) [size=4K]
>
>
> lsusb:
>
> Bus 002 Device 002: ID 0d8c:0001 C-Media Electronics, Inc. USB Speaker
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 1.10
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 8
> idVendor 0x0d8c C-Media Electronics, Inc.
> idProduct 0x0001 USB Speaker
> bcdDevice 0.10
> iManufacturer 1 C-Media INC.
> iProduct 2 USB Audio
> iSerial 0
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 110
> bNumInterfaces 2
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0x80
> MaxPower 500mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 0
> bInterfaceClass 1 Audio
> bInterfaceSubClass 1 Control Device
> bInterfaceProtocol 0
> iInterface 0
> AudioControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 1 (HEADER)
> bcdADC 1.00
> wTotalLength 40
> bInCollection 1
> baInterfaceNr( 0) 1
> AudioControl Interface Descriptor:
> bLength 12
> bDescriptorType 36
> bDescriptorSubtype 2 (INPUT_TERMINAL)
> bTerminalID 1
> wTerminalType 0x0101 USB Streaming
> bAssocTerminal 0
> bNrChannels 2
> wChannelConfig 0x0003
> Left Front (L)
> Right Front (R)
> iChannelNames 0
> iTerminal 0
> AudioControl Interface Descriptor:
> bLength 10
> bDescriptorType 36
> bDescriptorSubtype 6 (FEATURE_UNIT)
> bUnitID 13
> bSourceID 1
> bControlSize 1
> bmaControls( 0) 0x03
> Mute
> Volume
> bmaControls( 1) 0x00
> bmaControls( 2) 0x00
> iFeature 0
> AudioControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 3 (OUTPUT_TERMINAL)
> bTerminalID 3
> wTerminalType 0x0301 Speaker
> bAssocTerminal 0
> bSourceID 13
> iTerminal 0
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 0
> bNumEndpoints 0
> bInterfaceClass 1 Audio
> bInterfaceSubClass 2 Streaming
> bInterfaceProtocol 0
> iInterface 0
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 1
> bNumEndpoints 1
> bInterfaceClass 1 Audio
> bInterfaceSubClass 2 Streaming
> bInterfaceProtocol 0
> iInterface 0
> AudioStreaming Interface Descriptor:
> bLength 7
> bDescriptorType 36
> bDescriptorSubtype 1 (AS_GENERAL)
> bTerminalLink 1
> bDelay 1 frames
> wFormatTag 1 PCM
> AudioStreaming Interface Descriptor:
> bLength 11
> bDescriptorType 36
> bDescriptorSubtype 2 (FORMAT_TYPE)
> bFormatType 1 (FORMAT_TYPE_I)
> bNrChannels 2
> bSubframeSize 2
> bBitResolution 16
> bSamFreqType 1 Discrete
> tSamFreq[ 0] 48000
> Endpoint Descriptor:
> bLength 9
> bDescriptorType 5
> bEndpointAddress 0x06 EP 6 OUT
> bmAttributes 9
> Transfer Type Isochronous
> Synch Type Adaptive
> Usage Type Data
> wMaxPacketSize 0x00c0 1x 192 bytes
> bInterval 1
> bRefresh 0
> bSynchAddress 0
> AudioControl Endpoint Descriptor:
> bLength 7
> bDescriptorType 37
> bDescriptorSubtype 1 (EP_GENERAL)
> bmAttributes 0x00
> bLockDelayUnits 0 Undefined
> wLockDelay 0 Undefined
>
> EOF
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Next message: Adrian Bunk: "[RFC: 2.6 patch] dump_thread() cleanup"
Previous message: Vegard Lima: "Re: 2.6.15-rt1-sr1: xfs mount crash"
In reply to: Edgar Toernig: "2.6.15 USB-Audio produces loud noise"
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