Comment 3 for bug 1299567

The bug is caused by a kernel bug that produces ATA errors resulting in failed suspend when the power is plugged back in prior to suspend.

It is a duplicate of this bug which has expired:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539467

Relevant section of syslog:

Mar 29 11:01:20 lenovo kernel: [ 51.906860] ideapad_laptop: Unknown event: 1
Mar 29 11:01:20 lenovo kernel: [ 52.029487] ata2.00: exception Emask 0x10 SAct 0x1 SErr 0x50000 action 0xe frozen
Mar 29 11:01:20 lenovo kernel: [ 52.029493] ata2.00: irq_stat 0x00400000, PHY RDY changed
Mar 29 11:01:20 lenovo kernel: [ 52.029496] ata2: SError: { PHYRdyChg CommWake }
Mar 29 11:01:20 lenovo kernel: [ 52.029499] ata2.00: failed command: READ FPDMA QUEUED
Mar 29 11:01:20 lenovo kernel: [ 52.029505] ata2.00: cmd 60/00:00:20:88:00/01:00:0f:00:00/40 tag 0 ncq 131072 in
Mar 29 11:01:20 lenovo kernel: [ 52.029505] res 50/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA bus error)
Mar 29 11:01:20 lenovo kernel: [ 52.029507] ata2.00: status: { DRDY }