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[Bug 1313981] Re: Kernel disabling serial port ttyS0 on boot


Ok, yet another test kernel based on the debug in the previous one.  If
you could do the do and report back here please:


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  Kernel disabling serial port ttyS0 on boot

Status in “linux” package in Ubuntu:

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
   /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)
   PATH=(custom, no user)
  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
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
   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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