On Fri, 10 Apr 2015 17:21:03 -0700, Steven Grace wrote: >Now I see that you're using an older kernel -- the problem apparently >started with kernel version 3.19. You're lucky you're not affected! Hi, this is what happens for [rocketmouse@archlinux ~]$ pacman -Si linux | grep Ver; uname -rm Version : 3.19.3-3 3.19.3-3-ARCH x86_64 [1] and [rocketmouse@archlinux ~]$ uname -rm 3.18.9-rt5-2-rt x86_64 [2] So there seemingly is a serious issue on my machine too, but it's not related to snd_seq_midi, since it's not needed, as you can see by [2] before the USB devices are connected. Regards, Ralf [1] Indeed, with and without USB devices connected aconnect -i doesn't see my MIDI devices, neither the PCI/PCIe, nor the USB devices. Disconnected USB devices: [rocketmouse@archlinux ~]$ lsmod | grep midi snd_rawmidi 26806 2 snd_hdspm,snd_mpu401_uart snd_seq_device 13307 1 snd_rawmidi snd 73436 12 snd_ice1712,snd_ac97_codec,snd_hdspm,snd_hwdep,snd_timer,snd_i2c,snd_pcm,snd_rawmidi,snd_ak4xxx_adda,snd_mpu401_uart,snd_seq_device,snd_cs8427 [rocketmouse@archlinux ~]$ aconnect -i client 0: 'System' [type=kernel] 0 'Timer ' 1 'Announce ' client 14: 'Midi Through' [type=kernel] 0 'Midi Through Port-0' After connecting USB devices: [rocketmouse@archlinux ~]$ lsmod | grep midi snd_usbmidi_lib 27571 1 snd_usb_audio snd_rawmidi 26806 3 snd_hdspm,snd_usbmidi_lib,snd_mpu401_uart snd_seq_device 13307 3 snd_seq,snd_rawmidi,snd_seq_dummy snd 73436 15 snd_ice1712,snd_usb_audio,snd_ac97_codec,snd_hdspm,snd_hwdep,snd_timer,snd_i2c,snd_pcm,snd_seq,snd_rawmidi,snd_usbmidi_lib,snd_ak4xxx_adda,snd_mpu401_uart,snd_seq_device,snd_cs8427 usbcore 199382 9 uas,snd_usb_audio,usb_storage,ohci_hcd,ohci_pci,snd_usbmidi_lib,ehci_hcd,ehci_pci,usbhid [rocketmouse@archlinux ~]$ aconnect -i client 0: 'System' [type=kernel] 0 'Timer ' 1 'Announce ' client 14: 'Midi Through' [type=kernel] 0 'Midi Through Port-0' [2] Disconnected USB devices: [rocketmouse@archlinux ~]$ lsmod | grep midi snd_rawmidi 30863 2 snd_hdspm,snd_mpu401_uart snd_seq_device 14497 1 snd_rawmidi snd 87720 12 snd_ice1712,snd_ac97_codec,snd_hdspm,snd_hwdep,snd_timer,snd_i2c,snd_pcm,snd_rawmidi,snd_ak4xxx_adda,snd_mpu401_uart,snd_seq_device,snd_cs8427 [rocketmouse@archlinux ~]$ aconnect -i client 0: 'System' [type=kernel] 0 'Timer ' 1 'Announce ' client 14: 'Midi Through' [type=kernel] 0 'Midi Through Port-0' client 16: 'RME AIO_579bcc' [type=kernel] 0 'HDSPMx579bcc MIDI 1' client 20: 'TerraTec EWX24/96' [type=kernel] 0 'TerraTec EWX24/96 MIDI' client 24: 'TerraTec EWX24/96' [type=kernel] 0 'TerraTec EWX24/96 MIDI' After connecting USB devices: [rocketmouse@archlinux ~]$ lsmod | grep midi snd_usbmidi_lib 30258 1 snd_usb_audio snd_seq_midi 13564 0 snd_seq_midi_event 14935 1 snd_seq_midi snd_seq 71606 3 snd_seq_midi_event,snd_seq_dummy,snd_seq_midi snd_rawmidi 30863 4 snd_hdspm,snd_usbmidi_lib,snd_mpu401_uart,snd_seq_midi snd_seq_device 14497 4 snd_seq,snd_rawmidi,snd_seq_dummy,snd_seq_midi snd 87720 15 snd_ice1712,snd_usb_audio,snd_ac97_codec,snd_hdspm,snd_hwdep,snd_timer,snd_i2c,snd_pcm,snd_seq,snd_rawmidi,snd_usbmidi_lib,snd_ak4xxx_adda,snd_mpu401_uart,snd_seq_device,snd_cs8427 usbcore 243361 9 uas,snd_usb_audio,usb_storage,ohci_hcd,ohci_pci,snd_usbmidi_lib,ehci_hcd,ehci_pci,usbhid [rocketmouse@archlinux ~]$ aconnect -i client 0: 'System' [type=kernel] 0 'Timer ' 1 'Announce ' client 14: 'Midi Through' [type=kernel] 0 'Midi Through Port-0' client 16: 'RME AIO_579bcc' [type=kernel] 0 'HDSPMx579bcc MIDI 1' client 20: 'TerraTec EWX24/96' [type=kernel] 0 'TerraTec EWX24/96 MIDI' client 24: 'TerraTec EWX24/96' [type=kernel] 0 'TerraTec EWX24/96 MIDI' client 28: 'USB Device 0x170b:0x11' [type=kernel] 0 'USB Device 0x170b:0x11 MIDI 1' client 32: 'nanoKONTROL' [type=kernel] 0 'nanoKONTROL MIDI 1'