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 } -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1299567 Title: [LENOVO 20270] [regression] suspend/resume failure Status in “linux” package in Ubuntu: Confirmed Bug description: Upgraded to Ubuntu 14.04beta2 and susped failed on first attempt. Suspend functioned flawlessly in Ubuntu 13.10. ProblemType: KernelOops DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-20-generic 3.13.0-20.42 ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7 Uname: Linux 3.13.0-20-generic x86_64 Annotation: This occured during a previous suspend and prevented it from resuming properly. ApportVersion: 2.13.3-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: kathy 1754 F.... pulseaudio /dev/snd/controlC1: kathy 1754 F.... pulseaudio Date: Sat Mar 29 12:47:50 2014 ExecutablePath: /usr/share/apport/apportcheckresume Failure: suspend/resume HibernationDevice: RESUME=UUID=091196c9-ea53-4d0b-adef-ba5328cd2d63 InstallationDate: Installed on 2013-12-29 (89 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) InterpreterPath: /usr/bin/python3.4 MachineType: LENOVO 20270 ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume ProcEnviron: TERM=linux PATH=(custom, no user) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-20-generic.efi.signed root=UUID=14cc5254-69cd-49bd-99a2-0d71d8a2d26e ro quiet splash PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-20-generic N/A linux-backports-modules-3.13.0-20-generic N/A linux-firmware 1.126 SourcePackage: linux Title: [LENOVO 20270] suspend/resume failure UpgradeStatus: Upgraded to trusty on 2014-03-29 (0 days ago) UserGroups: dmi.bios.date: 09/04/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 7CCN32WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Cherry 4A Touch dmi.board.vendor: LENOVO dmi.board.version: 31900058STD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: IdeaPad U430 Touch dmi.modalias: dmi:bvnLENOVO:bvr7CCN32WW:bd09/04/2013:svnLENOVO:pn20270:pvrIdeaPadU430Touch:rvnLENOVO:rnCherry4ATouch:rvr31900058STD:cvnLENOVO:ct10:cvrIdeaPadU430Touch: dmi.product.name: 20270 dmi.product.version: IdeaPad U430 Touch dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1299567/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
