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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

@Hans109h -- ok so that shows this was a probe failure:

    [    0.596333] APW: pnp_device_probe: serial serial 00:0a
    [    0.596352] APW: pnp_device_probe: serial serial 00:0a probe failed

Nothing seems to have changed since saucy in the driver in question!?
So, I've added additional debug on that path and made another test
kernel.  If you could again boot test this kernel and supply the dmesg
output.  Kernel is the latest dated kernel (v201405061155) at the URL
below:

    http://people.canonical.com/~apw/lp1313981-trusty/

Please report any testing back here.

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https://bugs.launchpad.net/bugs/1313981

Title:
  Kernel disabling serial port ttyS0 on boot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  On boot in 13.10 kern.log would state:

   Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
   00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

  and my serial modem would work just fine.

  After upgrading to 14.04 the kernel log contains:

   Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
   serial 00:0a: disabled

  [[ Note that with the 3.13.0-24 kernel as reported in the bug below we see this:
  [    3.191190] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
  [    3.191342] serial 00:0a: disabled
  ]]

  How do I enable 00:0a?  Do I need to recompile the kernel with a different config?
  ---
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu-gnome   2581 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu-gnome   2581 F.... pulseaudio
  CasperVersion: 1.340
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash live-media=/dev/sdd1 --
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/13/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z77-V
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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