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Hi, |
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|
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I have recently upgraded to a newer kernel-version (from 2.6.12.r6 to |
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2.6.13-gentoo-r5) and just realized the USB MIDI interface, which was |
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working before, isn't recognized anymore. |
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Looking up dmesg spits this out: |
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|
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Unable to handle kernel NULL pointer dereference at virtual address 00000018 |
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printing eip: |
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c03e83cd |
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*pde = 00000000 |
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Oops: 0002 [#1] |
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PREEMPT SMP |
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Modules linked in: snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss |
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snd_seq_mid |
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vent snd_seq snd_usb_audio snd_usb_lib snd_rawmidi snd_seq_device snd_hwdep |
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snd_in |
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8x0 snd_ac97_codec snd_pcm snd_timer snd snd_page_alloc usbhid psmouse evdev |
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nvidi |
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ealtime usb_midi audio adi gameport |
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CPU: 0 |
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EIP: 0060:[<c03e83cd>] Tainted: P VLI |
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EFLAGS: 00010046 (2.6.13-gentoo-r5) |
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EIP is at _spin_lock_irqsave+0x1d/0x90 |
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eax: 00000000 ebx: 00000018 ecx: 00000001 edx: 00000202 |
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esi: dfce8000 edi: 00000001 ebp: dfce9e10 esp: dfce9ddc |
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ds: 007b es: 007b ss: 0068 |
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Process khubd (pid: 117, threadinfo=dfce8000 task=c1577530) |
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Stack: 00000018 00000000 c011b54e d9ca4b18 00000003 00000001 00000000 |
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00000000 |
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00000202 00000003 dfdd6800 dfdb0780 dfdb078c d987b920 e092ca8b 00000000 |
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df24f200 e092f620 e092f640 c0327a46 df24f200 df24f200 df24f214 df24f294 |
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Call Trace: |
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[<c011b54e>] __wake_up+0x1e/0x60 |
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[<e092ca8b>] usb_midi_disconnect+0xab/0xf8 [usb_midi] |
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[<c0327a46>] usb_unbind_interface+0x86/0x90 |
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[<c02bf93f>] __device_release_driver+0x8f/0xb0 |
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[<c02bf980>] device_release_driver+0x20/0x40 |
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[<c02bf089>] bus_remove_device+0x79/0x90 |
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[<c02be082>] device_del+0x32/0x90 |
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[<c0331aca>] usb_disable_device+0x16a/0x1a0 |
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[<c032a806>] usb_disconnect+0xa6/0x190 |
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[<c032cd07>] hub_port_connect_change+0x4c7/0x500 |
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[<c032d226>] hub_events+0x4e6/0x620 |
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[<c032d385>] hub_thread+0x25/0x130 |
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[<c0135970>] autoremove_wake_function+0x0/0x60 |
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[<c0135970>] autoremove_wake_function+0x0/0x60 |
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[<c032d360>] hub_thread+0x0/0x130 |
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[<c01354ba>] kthread+0xba/0xc0 |
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[<c0135400>] kthread+0x0/0xc0 |
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[<c0101215>] kernel_thread_helper+0x5/0x10 |
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Code: e8 59 ef ff ff eb c3 8d b4 26 00 00 00 00 83 ec 08 89 1c 24 89 c3 b8 |
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00 e0 f |
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f 89 74 24 04 21 e0 ff 40 14 89 c6 9c 5a fa 31 c0 <86> 03 84 c0 7e 14 c7 43 |
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04 00 |
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00 00 8b 74 24 04 89 d0 8b 1c |
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<6>note: khubd[117] exited with preempt_count 1 |
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uhci_hcd 0000:00:1d.1: suspend_rh (auto-stop) |
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|
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This was what appeared most strange to me. I've checked |
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/etc/hotplug/blacklist and it seems all right(a usb-midi entry) and |
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/etc/modules.autoload/kernel-2.6 for both, snd-usb-audio and usb-midi |
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entries. |
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After restarting alsasound it shows me that it sets two sound card devices |
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(one for built-in audio and snd-usb-audio). |
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|
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This is the content of /etc/modules.d/alsa: |
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|
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alias snd-card-0 snd-intel8x0 |
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alias sound-slot-0 snd-intel8x0 |
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alias snd-card-1 snd-usb-audio |
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alias sound-slot-1 snd-usb-audio |
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|
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Another double check on the kernel config revealed that all was in its |
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place, i.e. building snd-usb-audio as a module etc. |
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What could this be?? |
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|
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Karsten |
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