Comment 2 for bug 515109

kern.log:
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.471723] PM: Syncing filesystems ... done.
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.533022] PM: Preparing system for mem sleep
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.533028] Freezing user space processes ... (elapsed 0.00 seconds) done.
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.535108] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.535280] PM: Entering mem sleep
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.535296] Suspending console(s) (use no_console_suspend to debug)
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.630707] btusb_intr_complete: hci0 urb ffff8800379f2a80 failed to resubmit (1)
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.631689] btusb_bulk_complete: hci0 urb ffff8800379f2b40 failed to resubmit (1)
Feb 8 13:06:10 daniele-laptop kernel: [ 7308.632689] btusb_bulk_complete: hci0 urb ffff8800379f29c0 failed to resubmit (1)
Feb 8 13:06:10 daniele-laptop kernel: [ 7309.048189] sd 0:0:0:0: [sda] Synchronizing SCSI cache
Feb 8 13:06:10 daniele-laptop kernel: [ 7309.048325] sd 0:0:0:0: [sda] Stopping disk
Feb 8 13:06:10 daniele-laptop kernel: [ 7311.200174] pm_op(): usb_dev_suspend+0x0/0x20 returns -16
Feb 8 13:06:10 daniele-laptop kernel: [ 7311.200177] PM: Device usb1 failed to suspend: error -16
Feb 8 13:06:10 daniele-laptop kernel: [ 7311.200180] PM: Some devices failed to suspend
Feb 8 13:06:10 daniele-laptop kernel: [ 7311.330197] sd 0:0:0:0: [sda] Starting disk
Feb 8 13:06:10 daniele-laptop kernel: [ 7313.300724] PM: resume devices took 2.100 seconds
Feb 8 13:06:10 daniele-laptop kernel: [ 7313.300738] PM: Finishing wakeup.