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From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040115 Description of problem: USB Alsa Audio seems to be flaky and broken recently. I have two USB audio devices (USB Soundblaster -- some kind of Audigy or something, and a Logitech USB headset with mic) on this Dell Inspiron 5150 laptop, and both are causing oopses and error messages -- and failing to play when they are the target of sound using Alsa. Somebody else had similar troubles.... http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg09901.html Here is the reply from an Alsa dev suggesting a very small patch http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg09923.html > try to define SND_USE_ASYNC_UNLINK at the beginning of > sound/usb/usbaudio.c. there was a problem on 2.4 kernel, so it's > disabled as default, but it should be activated originally. I tried this, which it made a small change - sometimes it would work in mplayer until you moved around in the file - it did not make the problem go away. In 2.6.1 build 52 this line is still commented out. I believe something is badly buggered either in Alsa or in the Kernel with USB audio. Version-Release number of selected component (if applicable): kernel-2.6.1-1.52 (also present in recent 2.4+alsa?) How reproducible: Always Steps to Reproduce: 1. Plug in a USB audio device 2. Configure it for Alsa 3. Attempt to play stuff (eg, in mplayer) Actual Results: Here is what I see with the SND_USE_ASYNC_UNLINK uncommented as suggested Jan 25 08:03:44 fastcat kernel: Debug: sleeping function called from invalid context at kernel/sched.c:1748 Jan 25 08:03:44 fastcat kernel: in_atomic():0, irqs_disabled():1 Jan 25 08:03:44 fastcat kernel: Call Trace: Jan 25 08:03:44 fastcat kernel: [<c0127241>] __might_sleep+0x91/0xb0 Jan 25 08:03:44 fastcat kernel: [<c012537f>] wait_for_completion+0x1f/0x2f0 Jan 25 08:03:44 fastcat kernel: [<c014f8e4>] file_read_actor+0xe4/0xf0 Jan 25 08:03:44 fastcat kernel: [<f88e773d>] hcd_unlink_urb+0x3fd/0x6f0 [usbcore] Jan 25 08:03:44 fastcat kernel: [<c01a100a>] update_atime+0x9a/0xe0 Jan 25 08:03:44 fastcat kernel: [<f899ff70>] snd_complete_urb+0x0/0xd0 [snd_usb_audio] Jan 25 08:03:44 fastcat kernel: [<f88e85fd>] usb_unlink_urb+0x3d/0x40 [usbcore] Jan 25 08:03:44 fastcat kernel: [<f89a01cd>] deactivate_urbs+0xad/0xb0 [snd_usb_audio] Jan 25 08:03:44 fastcat kernel: [<f89a0432>] snd_usb_pcm_trigger+0x52/0x60 [snd_usb_audio] Jan 25 08:03:44 fastcat kernel: [<f89c5f75>] snd_pcm_do_stop+0x25/0x30 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89c57c9>] snd_pcm_action_single+0x39/0x70 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89c5990>] snd_pcm_action+0x190/0x1a0 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89cc8cf>] snd_pcm_update_hw_ptr+0x11f/0x1e0 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89c601f>] snd_pcm_stop+0x1f/0x30 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89c7860>] snd_pcm_playback_drop+0x1c0/0x3c0 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<f89ca9bc>] snd_pcm_playback_ioctl1+0x6c/0x5f0 [snd_pcm] Jan 25 08:03:44 fastcat kernel: [<c017a967>] vfs_read+0x107/0x160 Jan 25 08:03:44 fastcat kernel: [<c01946a5>] sys_ioctl+0xe5/0x260 Jan 25 08:03:44 fastcat kernel: [<c010c72f>] syscall_call+0x7/0xb Jan 25 08:03:44 fastcat kernel: Jan 25 08:03:44 fastcat kernel: cannot submit datapipe for urb 0, err = -22 Jan 25 08:04:25 fastcat last message repeated 8 times Jan 25 08:04:29 fastcat last message repeated 3 times Here is what I get playing video in mplayer on the normal 2.6.1-1.52 kernel... one second of video plays, then it holds the last frame (and will exit with q to quit nicely, its not crashed)... here is what is in /var/log/messages: Jan 25 12:19:46 fastcat kernel: cannot submit datapipe for urb 0, err = -38 Expected Results: In previous 2.4 kernels audio would play great, the last one I'm pretty sure was okay is 2.4 build 2097 I think. Additional info: Dell Inspiron 5150, 3GHz Intel nVidia video driver 1GB RAM Creative USB Soundblaster model SB0300 Logitech USB headset with mic
Playing back to Headset works reasonably well at the moment but generates the Oopses as shown in the previous comment. Playing back to the Audigy USB device just generates the -38 error in /var/log/messages and no output at all. This was working great on 2.4 kernel versions a few weeks ago. Some additional data: (Mozilla 1.6 doesn't seem to like the Create New Attachment POST button :-/ ) [root@fastcat linux-2.6.1-1.52]# cat /proc/asound/cards 0 [Headset ]: USB-Audio - Logitech USB Headset Logitech Logitech USB Headset at usb-0000:00:1d.0-1 1 [NX ]: USB-Audio - SB Audigy 2 NX Creative Technology Ltd SB Audigy 2 NX at usb-0000:00:1d.7-3.1 [root@fastcat linux-2.6.1-1.52]# lsmod Module Size Used by snd_usb_audio 63680 0 snd_rawmidi 28960 1 snd_usb_audio snd_seq_device 8456 1 snd_rawmidi snd_pcm 112136 1 snd_usb_audio snd_timer 32516 1 snd_pcm snd 55396 5 snd_usb_audio,snd_rawmidi,snd_seq_device,snd_pcm,snd_timer soundcore 10848 1 snd p8022 2560 0 psnap 4740 0 llc 7444 2 p8022,psnap evdev 9728 1 wacom 10624 0 nvidia 2075816 12 binfmt_misc 11144 1 md5 4224 1 ipv6 265856 10 autofs 16768 0 ds 14724 2 yenta_socket 17408 0 pcmcia_core 68320 2 ds,yenta_socket ipt_REJECT 6528 1 ipt_state 1920 1 ip_conntrack 30768 1 ipt_state iptable_filter 2816 1 ip_tables 17280 3 ipt_REJECT,ipt_state,iptable_filter b44 28804 0 sg 36760 0 microcode 7328 0 sbp2 28168 1 ide_cd 41220 0 cdrom 38812 1 ide_cd ohci1394 42756 0 ieee1394 295472 2 sbp2,ohci1394 sd_mod 17312 4 usb_storage 65728 1 scsi_mod 130744 4 sg,sbp2,sd_mod,usb_storage snd_page_alloc 11780 1 snd_pcm hid 69184 0 ehci_hcd 28804 0 uhci_hcd 43536 0 usbcore 121948 8 snd_usb_audio,wacom,usb_storage,hid,ehci_hcd,uhci_hcd thermal 13200 0 processor 14116 1 thermal fan 4108 0 button 6168 0 battery 9740 0 asus_acpi 10136 0 ac 4876 0 ext3 131496 4 jbd 88088 1 ext3
Got a reply from the Alsa mailing list from Takahi Iwai who seems to be an important dev on Alsa: http://www.mail-archive.com/alsa-user%40lists.sourceforge.net/msg11780.html > yes, it's a known bug in the old ALSA driver. > already fixed in the recent code. I'm going to go on and try to put a more recent Alsa into the Redhat Kernel myself... could Redhat consider to update alsa in their 2.6 kernel for FC2??? (Or at least release-note that snd-usb-audio will barf until it is fixed upstream?)
The best thing you can do to get this into the official FC2 kernel is to convince LKML upstream to merge the fixes in the newer versions of ALSA.
Hi Warren - this was fixed upstream a couple of weeks afterwards. I still have another strange problem where my USB device will not work properly if it is left in during an FC2 powerup and boot. It works fine if I pull it out before the boot, and plug it in afterwards. What is strange is that it WILL NOT work if it was in during the boot, no matter cycling the device power, removing all ALSA modules and trying again, etc. Anyway I will take that up on the Alsa list, thanks for your reply.