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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1576451

Title:
  Linux 4.4.0: wrong value for /sys/*/queue/discard_granularity

Status in linux package in Ubuntu:
  Confirmed
Status in linux package in Fedora:
  Unknown

Bug description:
  With kernel 4.4.0-21.37 in xenial and yakkety, the value of
  queue/discard_granularity is set to '1' instead of to a multiple of
  the block size as expected.

  $ cat /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/discard_granularity
  1
  $

  This is at odds with the values on ramdisks:
  $ cat /sys/devices/virtual/block/ram0/queue/discard_granularity
  4096
  $

  And with lvm2 2.02.150-1ubuntu1, currently in yakkety-proposed, this
  always results in an error message from lvremove if discard is
  configured, and discard is not actually used; e.g., from my schroot
  output:

  E: 05lvm:   WARNING: Device /dev/sda7: queue/discard_granularity is 1
  and is unexpectedly less than sector.

  This bug has also been reported against Linux 4.4 in Fedora.
  https://bugzilla.redhat.com/show_bug.cgi?id=1314687

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vorlon     3681 F.... pulseaudio
   /dev/snd/pcmC0D0p:   vorlon     3681 F...m pulseaudio
   /dev/snd/controlC0:  vorlon     3681 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Apr 28 16:39:54 2016
  HibernationDevice: RESUME=UUID=6df76279-19ea-45a4-bec9-e4fdc858729a
  InstallationDate: Installed on 2010-09-24 (2043 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 2306CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-15 (13 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET97WW (2.57 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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