When I plug in my Kobo ereader, quite often it fails to mount. Only when I disconnect it and reconnect it again does it actually mount.
dmesg reports this:
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[25675.105781] usb 3-3.4.4: new high-speed USB device number 12 using xhci_hcd
[25675.201787] usb 3-3.4.4: New USB device found, idVendor=2237, idProduct=4225
[25675.201789] usb 3-3.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[25675.201791] usb 3-3.4.4: Product: eReader-4.7.10413
[25675.201793] usb 3-3.4.4: Manufacturer: Kobo
[25675.201794] usb 3-3.4.4: SerialNumber: N7096898687
[25675.231825] usb-storage 3-3.4.4:1.0: USB Mass Storage device detected
[25675.231905] scsi host8: usb-storage 3-3.4.4:1.0
[25675.231960] usbcore: registered new interface driver usb-storage
[25675.233827] usbcore: registered new interface driver uas
[25676.243677] scsi 8:0:0:0: Direct-Access Kobo eReader-4.7.1041 0110 PQ: 0 ANSI: 2
[25676.243937] sd 8:0:0:0: Attached scsi generic sg3 type 0
[25676.246575] sd 8:0:0:0: Power-on or device reset occurred
[25676.249542] sd 8:0:0:0: [sdc] 14139389 512-byte logical blocks: (7.24 GB/6.74 GiB)
[25676.357525] sd 8:0:0:0: [sdc] Write Protect is off
[25676.357527] sd 8:0:0:0: [sdc] Mode Sense: 0f 00 00 00
[25676.467596] sd 8:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[25676.702711] sdc:
[25676.965997] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25677.178440] sd 8:0:0:0: Power-on or device reset occurred
[25677.287569] sd 8:0:0:0: [sdc] Attached SCSI removable disk
[25677.365996] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25677.578445] sd 8:0:0:0: Power-on or device reset occurred
[25677.679339] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25677.888457] sd 8:0:0:0: Power-on or device reset occurred
[25677.979339] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25678.188460] sd 8:0:0:0: Power-on or device reset occurred
[25678.276076] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25678.488482] sd 8:0:0:0: Power-on or device reset occurred
[25678.572724] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25678.778493] sd 8:0:0:0: Power-on or device reset occurred
[25678.862672] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25679.068468] sd 8:0:0:0: Power-on or device reset occurred
[25679.068475] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[25679.068477] sd 8:0:0:0: [sdc] tag#0 Sense Key : Unit Attention [current]
[25679.068478] sd 8:0:0:0: [sdc] tag#0 Add. Sense: Power on, reset, or bus device reset occurred
[25679.068480] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 d7 bc 18 00 00 08 00
[25679.068481] print_req_error: I/O error, dev sdc, sector 14138392
[25679.596085] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25679.808471] sd 8:0:0:0: Power-on or device reset occurred
[25679.819705] sdc:
[25679.899480] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25680.108451] sd 8:0:0:0: Power-on or device reset occurred
[25680.192772] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25680.398419] sd 8:0:0:0: Power-on or device reset occurred
[25680.482757] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25680.688527] sd 8:0:0:0: Power-on or device reset occurred
[25680.688539] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[25680.688543] sd 8:0:0:0: [sdc] tag#0 Sense Key : Unit Attention [current]
[25680.688547] sd 8:0:0:0: [sdc] tag#0 Add. Sense: Power on, reset, or bus device reset occurred
[25680.688551] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 d7 bf 00 00 00 08 00
[25680.688553] print_req_error: I/O error, dev sdc, sector 14139136
[25681.216112] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25681.428443] sd 8:0:0:0: Power-on or device reset occurred
[25681.512780] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25681.718435] sd 8:0:0:0: Power-on or device reset occurred
[25681.802710] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25682.008482] sd 8:0:0:0: Power-on or device reset occurred
[25682.008493] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[25682.008495] sd 8:0:0:0: [sdc] tag#0 Sense Key : Unit Attention [current]
[25682.008498] sd 8:0:0:0: [sdc] tag#0 Add. Sense: Power on, reset, or bus device reset occurred
[25682.008501] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 02 00 00 06 00
[25682.008503] print_req_error: I/O error, dev sdc, sector 2
[25682.008508] Buffer I/O error on dev sdc, logical block 2, async page read
[25682.008511] Buffer I/O error on dev sdc, logical block 3, async page read
[25682.008513] Buffer I/O error on dev sdc, logical block 4, async page read
[25682.008515] Buffer I/O error on dev sdc, logical block 5, async page read
[25682.008517] Buffer I/O error on dev sdc, logical block 6, async page read
[25682.008519] Buffer I/O error on dev sdc, logical block 7, async page read
[25682.008594] ldm_validate_partition_table(): Disk read failed.
[25682.008666] sdc: unable to read partition table
[25682.526111] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25682.738450] sd 8:0:0:0: Power-on or device reset occurred
[25682.822794] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25683.028451] sd 8:0:0:0: Power-on or device reset occurred
[25683.112754] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25683.318457] sd 8:0:0:0: Power-on or device reset occurred
[25683.318466] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[25683.318468] sd 8:0:0:0: [sdc] tag#0 Sense Key : Unit Attention [current]
[25683.318470] sd 8:0:0:0: [sdc] tag#0 Add. Sense: Power on, reset, or bus device reset occurred
[25683.318473] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 02 00 00 06 00
[25683.318474] print_req_error: I/O error, dev sdc, sector 2
[25683.318478] Buffer I/O error on dev sdc, logical block 2, async page read
[25683.318481] Buffer I/O error on dev sdc, logical block 3, async page read
[25683.318482] Buffer I/O error on dev sdc, logical block 4, async page read
[25683.318484] Buffer I/O error on dev sdc, logical block 5, async page read
[25683.318560] ldm_validate_partition_table(): Disk read failed.
[25683.318649] sdc: unable to read partition table
[25683.836142] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25684.422830] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25684.628451] sd 8:0:0:0: Power-on or device reset occurred
[25684.712795] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25684.928464] sd 8:0:0:0: Power-on or device reset occurred
[25685.012826] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25685.105695] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[25685.105701] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 02 00 00 06 00
[25685.105703] print_req_error: I/O error, dev sdc, sector 2
[25685.208459] sd 8:0:0:0: Power-on or device reset occurred
[25685.223633] ldm_validate_partition_table(): Disk read failed.
[25685.223643] sdc: unable to read partition table
[25685.299477] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25685.508473] sd 8:0:0:0: Power-on or device reset occurred
[25685.592868] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25685.798432] sd 8:0:0:0: Power-on or device reset occurred
[25685.882849] usb 3-3.4.4: reset high-speed USB device number 12 using xhci_hcd
[25686.088459] sd 8:0:0:0: Power-on or device reset occurred
[25686.088471] sd 8:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[25686.088474] sd 8:0:0:0: [sdc] tag#0 Sense Key : Unit Attention [current]
[25686.088477] sd 8:0:0:0: [sdc] tag#0 Add. Sense: Power on, reset, or bus device reset occurred
[25686.088480] sd 8:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 d7 bf 00 00 00 08 00
[25686.088482] print_req_error: I/O error, dev sdc, sector 14139136
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[25796.658294] print_req_error: I/O error, dev sdc, sector 1008
[25833.980348] usb 3-3.4-port4: Cannot enable. Maybe the USB cable is bad?
[25836.895680] usb 3-3.4.4: new high-speed USB device number 16 using xhci_hcd
[25836.991657] usb 3-3.4.4: New USB device found, idVendor=2237, idProduct=4225
[25836.991660] usb 3-3.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[25836.991661] usb 3-3.4.4: Product: eReader-4.7.10413
[25836.991663] usb 3-3.4.4: Manufacturer: Kobo
[25836.991665] usb 3-3.4.4: SerialNumber: N7096898687
[25836.994688] usb-storage 3-3.4.4:1.0: USB Mass Storage device detected
[25836.994900] scsi host8: usb-storage 3-3.4.4:1.0
[25838.006763] scsi 8:0:0:0: Direct-Access Kobo eReader-4.7.1041 0110 PQ: 0 ANSI: 2
[25838.007202] sd 8:0:0:0: Attached scsi generic sg3 type 0
[25838.009689] sd 8:0:0:0: Power-on or device reset occurred
[25838.012703] sd 8:0:0:0: [sdc] 14139389 512-byte logical blocks: (7.24 GB/6.74 GiB)
[25838.116520] sd 8:0:0:0: [sdc] Write Protect is off
[25838.116524] sd 8:0:0:0: [sdc] Mode Sense: 0f 00 00 00
[25838.226557] sd 8:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[25838.461637] sdc:
[25838.686447] sd 8:0:0:0: [sdc] Attached SCSI removable disk
[25838.879246] usb 3-3.4.4: reset high-speed USB device number 16 using xhci_hcd
[25839.087356] sd 8:0:0:0: Power-on or device reset occurred
[25839.275535] FAT-fs (sdc): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
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$ cat /sys/module/usbcore/parameters/autosuspend
2