After suspending, the usbdisk sound card alsa driver breaks and does not play any further. I believe this is might be due to the trace below from the dmesg.
This definitely begins to occur between v2.6.23 and v2.6.23-rc2. I couldn't bisect it down to a single commit.
This fails with with all kernels up to at least today's git.
Full links at the bottom.
Linux tulip 2.6.25-rc6 #6 PREEMPT Wed Mar 19 22:16:23 PDT 2008 i686 AMD Athlon(tm) XP 2700+ AuthenticAMD GNU/Linux
Gnu C 4.2.3 Gnu make 3.81 binutils 2.18 util-linux 2.13.1 mount 2.13.1 module-init-tools 3.4 e2fsprogs 1.40.8 xfsprogs 2.9.7 PPP 2.4.4 Linux C Library 2.7 Dynamic linker (ldd) 2.7 Procps 3.2.7 Net-tools 1.60 Kbd 1.13 Sh-utils 6.9 udev 119 Modules Loaded netconsole configfs snd_pcm_oss snd_mixer_oss
Relevant looking parts of the dmesg (full dmesg link below): [ 3895.879517] usb 1-4: New USB device found, idVendor=2001, idProduct=f103 [ 3895.879517] usb 1-4: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 3895.879517] usb 3-1: USB disconnect, address 2 [ 3896.252863] usb 3-1: new full speed USB device using ohci_hcd and address 3 [ 3896.452987] usb 3-1: configuration #1 chosen from 1 choice [ 3896.458877] ALSA /usr/src/linux-2.6/sound/usb/usbaudio.c:2798: 3:1:1: add audio endpoint 0x1 [ 3896.470877] ALSA /usr/src/linux-2.6/sound/usb/usbaudio.c:2798: 3:2:1: add audio endpoint 0x82 [ 3896.482878] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [13] FU [Mic Playback Switch] ch = 1, val = 0/1/1 [ 3896.521857] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue = 0x200, wIndex = 0xd00, type = 4, data = 0x18/0x0 [ 3896.554854] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [13] FU [Mic Playback Volume] ch = 1, val = 0/12240/384 [ 3896.554870] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [9] FU [Speaker Playback Switch] ch = 1, val = 0/1/1 [ 3896.593850] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue = 0x201, wIndex = 0x900, type = 4, data = 0x18/0x0 [ 3896.608842] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [9] FU [Speaker Playback Volume] ch = 2, val = -7264/-16/48 [ 3896.608859] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [10] FU [Mic Capture Switch] ch = 1, val = 0/1/1 [ 3896.647835] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue = 0x200, wIndex = 0xa00, type = 4, data = 0x18/0x0 [ 3896.680836] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [10] FU [Mic Capture Volume] ch = 1, val = 0/6096/384 [ 3896.680849] ALSA /usr/src/linux-2.6/sound/usb/usbmixer.c:988: [10] FU [Auto Gain Control] ch = 1, val = 0/1/1 [ 3896.680880] sysfs: duplicate filename 'card1' can not be created [ 3896.680891] ------------[ cut here ]------------ [ 3896.680893] WARNING: at /usr/src/linux-2.6/fs/sysfs/dir.c:424 sysfs_add_one+0x82/0xa0() [ 3896.680896] Modules linked in: netconsole configfs snd_pcm_oss snd_mixer_oss [ 3896.680903] Pid: 174, comm: khubd Not tainted 2.6.25-rc6 #6 [ 3896.680906] [<c011b0ef>] warn_on_slowpath+0x5f/0x90 [ 3896.680914] [<c0115fde>] __wake_up_common+0x3e/0x70 [ 3896.680918] [<c011b85b>] wake_up_klogd+0x3b/0x40 [ 3896.680922] [<c017d591>] find_inode+0x31/0x60 [ 3896.680927] [<c01a8c40>] sysfs_ilookup_test+0x0/0x10 [ 3896.680930] [<c011c0cb>] printk+0x1b/0x20 [ 3896.680933] [<c01a9012>] sysfs_add_one+0x82/0xa0 [ 3896.680937] [<c01a9dfc>] sysfs_create_link+0x8c/0x100 [ 3896.680940] [<c02f2cb4>] device_add+0x254/0x460 [ 3896.680946] [<c02f2f58>] device_create+0x88/0xc0 [ 3896.680949] [<c038aa06>] snd_card_register+0x276/0x380 [ 3896.680954] [<c03b2ae9>] usb_audio_probe+0x459/0xa00 [ 3896.680959] [<c01a8c40>] sysfs_ilookup_test+0x0/0x10 [ 3896.680963] [<c0342c66>] usb_probe_interface+0xb6/0x140 [ 3896.680969] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.680973] [<c02f4ba1>] driver_probe_device+0x81/0x180 [ 3896.680976] [<c043ecc9>] klist_next+0x69/0xd0 [ 3896.680981] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.680984] [<c02f3e76>] bus_for_each_drv+0x46/0x70 [ 3896.680988] [<c02f4d5b>] device_attach+0x7b/0x80 [ 3896.680991] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.680994] [<c02f3e07>] bus_attach_device+0x47/0x70 [ 3896.680997] [<c02f2dfb>] device_add+0x39b/0x460 [ 3896.681000] [<c0340b4d>] usb_set_configuration+0x30d/0x5d0 [ 3896.681004] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.681007] [<c0349186>] generic_probe+0x76/0xb0 [ 3896.681012] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.681015] [<c0342a20>] usb_probe_device+0x30/0x40 [ 3896.681018] [<c02f4ba1>] driver_probe_device+0x81/0x180 [ 3896.681021] [<c043ecc9>] klist_next+0x69/0xd0 [ 3896.681024] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.681027] [<c02f3e76>] bus_for_each_drv+0x46/0x70 [ 3896.681030] [<c02f4d5b>] device_attach+0x7b/0x80 [ 3896.681033] [<c02f4ca0>] __device_attach+0x0/0x10 [ 3896.681036] [<c02f3e07>] bus_attach_device+0x47/0x70 [ 3896.681039] [<c02f2dfb>] device_add+0x39b/0x460 [ 3896.681042] [<c033b07b>] usb_configure_device+0x5b/0x100 [ 3896.681045] [<c033b33b>] usb_new_device+0x5b/0x180 [ 3896.681048] [<c033c957>] hub_thread+0x637/0xd10 [ 3896.681051] [<c012ddb0>] autoremove_wake_function+0x0/0x40 [ 3896.681058] [<c033c320>] hub_thread+0x0/0xd10 [ 3896.681060] [<c012da82>] kthread+0x42/0x70 [ 3896.681063] [<c012da40>] kthread+0x0/0x70 [ 3896.681066] [<c0104b9f>] kernel_thread_helper+0x7/0x18 [ 3896.681071] ======================= [ 3896.681073] ---[ end trace 87ceb0cbe974168a ]--- [ 3896.689903] input: C-Media USB Headphone Set as /devices/pci0000:00/0000:00:02.1/usb3/3-1/3-1:1.3/input/input9 [ 3896.763158] input: USB HID v1.00 Device [C-Media USB Headphone Set ] on usb-0000:00:02.1-1 [ 3896.763218] usb 3-1: New USB device found, idVendor=0d8c, idProduct=000c [ 3896.763221] usb 3-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [ 3896.763224] usb 3-1: Product: C-Media USB Headphone Set
/proc/modules netconsole 8064 0 - Live 0xf88eb000 configfs 21396 2 netconsole, Live 0xf88f3000 snd_pcm_oss 45280 0 - Live 0xf88fa000 snd_mixer_oss 14784 1 snd_pcm_oss, Live 0xf88e6000
http://avuton.googlepages.com/dmesg-2.6.25-rc6-032008 http://avuton.googlepages.com/iomem-032008 http://avuton.googlepages.com/ioports-032008 http://avuton.googlepages.com/lspci-vvv-032008 http://avuton.googlepages.com/tulip-config