Pardon me if I'm reviving an old bug...

But I am experiencing this with 12.04 counter to what the last comment says.

I have a desktop at work, it only happens when I leave it idle (xscreensaver running) over the weekend.

I have a usb external harddrive, usb keyboard and mouse (mouse and keyboard through monitor usb hub).

When I come back on Monday morning, it never works, all USB ports are dead.

about 23 hours of inactivity I get this. And after it I start getting input/output errors on the usb hard drive (have a batch process running on it).

Aug 11 11:01:33 5700c-lathan kernel: [437078.190296] hub 2-1:1.0: cannot reset port 5 (err = -110)
Aug 11 11:01:34 5700c-lathan kernel: [437079.202267] hub 2-1:1.0: cannot reset port 5 (err = -110)
Aug 11 11:01:35 5700c-lathan kernel: [437080.214254] hub 2-1:1.0: cannot reset port 5 (err = -110)
Aug 11 11:01:36 5700c-lathan kernel: [437081.226196] hub 2-1:1.0: cannot reset port 5 (err = -110)
Aug 11 11:01:37 5700c-lathan kernel: [437082.238165] hub 2-1:1.0: cannot reset port 5 (err = -110)
Aug 11 11:01:37 5700c-lathan kernel: [437082.238168] hub 2-1:1.0: Cannot enable port 5.  Maybe the USB cable is bad?
Aug 11 11:01:38 5700c-lathan kernel: [437083.250152] hub 2-1:1.0: cannot disable port 5 (err = -110)
Aug 11 11:01:39 5700c-lathan kernel: [437084.262127] hub 2-1:1.0: cannot disable port 5 (err = -110)
Aug 11 11:01:39 5700c-lathan kernel: [437084.262184] sd 7:0:0:0: Device offlined - not ready after error recovery
Aug 11 11:01:39 5700c-lathan kernel: [437084.262191] sd 7:0:0:0: [sdc] Unhandled error code
Aug 11 11:01:39 5700c-lathan kernel: [437084.262192] sd 7:0:0:0: [sdc]  Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK
Aug 11 11:01:39 5700c-lathan kernel: [437084.262194] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 6d b0 6e 97 00 00 10 00
Aug 11 11:01:39 5700c-lathan kernel: [437084.262199] end_request: I/O error, dev sdc, sector 1840279191
Aug 11 11:01:39 5700c-lathan kernel: [437084.262202] Buffer I/O error on device sdc1, logical block 230034891
Aug 11 11:01:39 5700c-lathan kernel: [437084.262204] Buffer I/O error on device sdc1, logical block 230034892
Aug 11 11:01:39 5700c-lathan kernel: [437084.262212] sd 7:0:0:0: rejecting I/O to offline device
Aug 11 11:01:39 5700c-lathan kernel: [437084.262214] sd 7:0:0:0: [sdc] killing request
Aug 11 11:01:39 5700c-lathan kernel: [437084.262222] sd 7:0:0:0: [sdc] Unhandled error code
Aug 11 11:01:39 5700c-lathan kernel: [437084.262223] sd 7:0:0:0: [sdc]  Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Aug 11 11:01:39 5700c-lathan kernel: [437084.262224] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 52 9b 48 b7 00 00 28 00
Aug 11 11:01:39 5700c-lathan kernel: [437084.262228] end_request: I/O error, dev sdc, sector 1385908407
Aug 11 11:01:39 5700c-lathan kernel: [437084.262230] Buffer I/O error on device sdc1, logical block 173238543
Aug 11 11:01:39 5700c-lathan kernel: [437084.262233] Buffer I/O error on device sdc1, logical block 173238544
Aug 11 11:01:39 5700c-lathan kernel: [437084.262235] Buffer I/O error on device sdc1, logical block 173238545
Aug 11 11:01:39 5700c-lathan ntfs-3g[2483]: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Aug 11 11:01:39 5700c-lathan kernel: [437084.262236] Buffer I/O error on device sdc1, logical block 173238546
Aug 11 11:01:39 5700c-lathan kernel: [437084.262238] Buffer I/O error on device sdc1, logical block 173238547
Aug 11 11:01:39 5700c-lathan kernel: [437084.262278] sd 7:0:0:0: rejecting I/O to offline device