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[Bug 1538406] Status changed to Confirmed


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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  REGRESSION ThinkPad T410 fails to see AHCI device on boot with wily
  SRU kernels

Status in linux package in Ubuntu:

Bug description:
  We have a set of ThinkPads (T410 and T540p) that are failing to boot
  (not locating their root fs device) with post-release kernels.

  The AHCI adaptor (0000:00:1f.5) simply isn't visible in

  The problem is apparent in, and not in 4.2.0-16.19

  If the SATA device mode is changed from AHCI to IDE emulation, then
  they reliably boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: Unity
  Date: Wed Jan 27 16:41:50 2016
  HibernationDevice: RESUME=UUID=185cef3a-6688-4034-a910-4f6ecdea2c20
   enp0s25   no wireless extensions.
   lo        no wireless extensions.
   enx8a549328aae7  no wireless extensions.
  MachineType: LENOVO 253725M
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=e5bcc2d8-520b-4648-9a08-0cc1d65152fd ro BOOTIF=01-f0-de-f1-49-05-1b quiet splash crashkernel=384M-:128M
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/01/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6IET75WW (1.35 )
  dmi.board.name: 253725M
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6IET75WW(1.35):bd02/01/2011:svnLENOVO:pn253725M:pvrThinkPadT410:rvnLENOVO:rn253725M:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 253725M
  dmi.product.version: ThinkPad T410
  dmi.sys.vendor: LENOVO

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