Estou no Ubuntu 17.10. Eu conecto meu iPad e "Confio neste computador". Ele monta bem e eu posso copiar arquivos no meu iPad.
Eu, então, desmonto-o (clique no botão 'eject' no Nemo) e se eu tentar conectar novamente, o Ubuntu faz um som, mas não o monta.
Se eu mudar para outra porta USB, ele se conectará, mas, novamente, depois que eu desconectar, ela não será montada novamente em nenhuma das portas USB usadas. Quando eu estiver sem portas USB, tenho que reiniciar o Ubuntu para que ele funcione novamente.
Não sei ao certo para onde solucionar problemas, mas aqui estão as últimas linhas do dmesg
[ 123.396321] usb 1-2: new high-speed USB device number 4 using xhci_hcd[ 123.541075] usb 1-2: New USB device found, idVendor=05ac, idProduct=12ab
[ 123.541085] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 123.541091] usb 1-2: Product: iPad
[ 123.541098] usb 1-2: Manufacturer: Apple Inc.
[ 123.541104] usb 1-2: SerialNumber: f4502336fbe696c3d4e8571331f5e803c39037a6
[ 124.964359] ipheth 1-2:4.2: Apple iPhone USB Ethernet device attached
[ 124.964439] usbcore: registered new interface driver ipheth
[ 124.972213] ipheth 1-2:4.2 enp0s20f0u2c4i2: renamed from eth0
[ 124.991443] IPv6: ADDRCONF(NETDEV_UP): enp0s20f0u2c4i2: link is not ready
[ 124.992044] IPv6: ADDRCONF(NETDEV_UP): enp0s20f0u2c4i2: link is not ready
[20569.516047] perf: interrupt took too long (2560 > 2500), lowering kernel.perf_event_max_sample_rate to 78000
[29842.636538] perf: interrupt took too long (3269 > 3200), lowering kernel.perf_event_max_sample_rate to 61000
[35579.994541] ipheth 1-2:4.2: ipheth_rcvbulk_callback: urb status: -71
[35579.995348] usb 1-2: USB disconnect, device number 4
[35580.035540] ipheth 1-2:4.2: Apple iPhone USB Ethernet now disconnected
[35870.631947] usb 1-2: new high-speed USB device number 5 using xhci_hcd
[35870.777588] usb 1-2: New USB device found, idVendor=05ac, idProduct=12ab
[35870.777598] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[35870.777605] usb 1-2: Product: iPad
[35870.777612] usb 1-2: Manufacturer: Apple Inc.
[35870.777617] usb 1-2: SerialNumber: f4502336fbe696c3d4e8571331f5e803c39037a6
[35876.099655] usb 1-2: USB disconnect, device number 5
[35881.111704] usb 1-1: new high-speed USB device number 6 using xhci_hcd
[35881.256954] usb 1-1: New USB device found, idVendor=05ac, idProduct=12ab
[35881.256965] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[35881.256972] usb 1-1: Product: iPad
[35881.256979] usb 1-1: Manufacturer: Apple Inc.
[35881.256984] usb 1-1: SerialNumber: f4502336fbe696c3d4e8571331f5e803c39037a6
[35881.339532] ipheth 1-1:4.2: Apple iPhone USB Ethernet device attached
[35881.359115] ipheth 1-1:4.2 enp0s20f0u1c4i2: renamed from eth0
[35881.611703] IPv6: ADDRCONF(NETDEV_UP): enp0s20f0u1c4i2: link is not ready
[35881.614659] IPv6: ADDRCONF(NETDEV_UP): enp0s20f0u1c4i2: link is not ready
[36101.825275] ipheth 1-1:4.2: ipheth_rcvbulk_callback: urb status: -71
[36101.825954] usb 1-1: USB disconnect, device number 6
[36101.859619] ipheth 1-1:4.2: Apple iPhone USB Ethernet now disconnected
[41730.499127] perf: interrupt took too long (4100 > 4086), lowering kernel.perf_event_max_sample_rate to 48750
[42929.614766] usb 1-1: new high-speed USB device number 7 using xhci_hcd
[42929.760395] usb 1-1: New USB device found, idVendor=05ac, idProduct=12ab
[42929.760405] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[42929.760412] usb 1-1: Product: iPad
[42929.760419] usb 1-1: Manufacturer: Apple Inc.
[42929.760424] usb 1-1: SerialNumber: f4502336fbe696c3d4e8571331f5e803c39037a6
Edit: descobri que, se eu executar isso:
sudo /usr/sbin/usbmuxd -U usbmux
O iPad será montado sem a necessidade de reinicialização. Mas por que eu tenho que fazer isso manualmente depois de uma porta USB ter sido usada uma vez sem nenhum problema?