dmesg

[  708.894829] ehci-pci 0000:00:13.2: port 7 reset error -110
[  709.710819] ehci-pci 0000:00:13.2: port 7 reset error -110
[  710.526817] ehci-pci 0000:00:13.2: port 7 reset error -110
[  711.136104] hub 1-0:1.0: Cannot enable port 7.  Maybe the USB cable is bad?
[  711.136142] hub 1-0:1.0: unable to enumerate USB device on port 7
[ 2225.809394] input: ImPS/2 Generic Wheel Mouse as /devices/platform/i8042/serio1/input/input83
[ 5005.544506] JFS: nTxBlock = 8192, nTxLock = 65536
[ 5005.654293] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
[ 5405.948444] perf samples too long (2502 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[12492.491431] usbcore: registered new interface driver usb-storage