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[Edward Donovan <855199@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux
       Status: New => Confirmed

** Changed in: mythbuntu
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/855199

Title:
  2.6.39 and later have lost "irqfixup" and "irqpoll" functionality

Status in The Linux Kernel:
  Confirmed
Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Confirmed
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  I have several similar HP boxes that boot with IRQ errors, for the USB
  subsystem, like this:

    irq 19: nobody cared (try booting with the "irqpoll" option)
    ...

  So I have indeed always used the "irqpoll" kernel argument, and that
  has fixed the USB performance problems.

  Under 2.6.39 and 3.0, the irqpoll fix has stopped working.  The logs
  say "try booting with the 'irqpoll' option", though they also show
  that argument was present.

  Here is some context on the IRQ errors:

  These machines all have a PCI-E x16 slot, for video cards.  They only
  have the IRQ problems when that slot is used; if I revert to onboard
  video, they go away.  When I do use a video card, as I'd prefer to do,
  the errors come regardless of which card, whether it is ATI or Nvidia,
  with open or proprietary drivers.  "Irqpoll" has always taken care of
  them, until 2.6.39 arrived.

  At first I was uncertain whether it was just a problem with the boot
  argument taking effect, but now I have seen the logs do say "Misrouted
  IRQ fixup and polling support enabled".

  I'll be happy to provide more information, if possible.  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-11-generic 3.0.0-11.18
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: IXP [ATI IXP], device 0: ATI IXP AC97 [ATI IXP AC97]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ed         1696 F.... pulseaudio
   /dev/snd/controlC0:  ed         1696 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'IXP'/'ATI IXP rev 2 with ALC655 at 0xfe02a000, irq 17'
     Mixer name	: 'Realtek ALC655 rev 0'
     Components	: 'AC97a:414c4760'
     Controls      : 41
     Simple ctrls  : 26
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xfcffc000 irq 18'
     Mixer name	: 'Nvidia GPU 0d HDMI/DP'
     Components	: 'HDA:10de000d,10de0101,00100100'
     Controls      : 17
     Simple ctrls  : 5
  Date: Tue Sep 20 21:19:35 2011
  HibernationDevice: RESUME=UUID=821c96d0-f0af-4f34-a8c6-2713248cacc1
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  MachineType: Hewlett-Packard HP dx5150 MT
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=7649d274-b118-4ac7-b7c8-2fb7e42094bf ro quiet splash irqpoll vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-11-generic N/A
   linux-backports-modules-3.0.0-11-generic  N/A
   linux-firmware                            1.60
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-09-20 (0 days ago)
  dmi.bios.date: 08/01/2006
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 1.18
  dmi.board.name: 09AC
  dmi.board.vendor: MSI
  dmi.chassis.asset.tag: 2UA63214R9
  dmi.chassis.type: 3
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr1.18:bd08/01/2006:svnHewlett-Packard:pnHPdx5150MT:pvr:rvnMSI:rn09AC:rvr:cvnHewlett-Packard:ct3:cvr:
  dmi.product.name: HP dx5150 MT
  dmi.sys.vendor: Hewlett-Packard

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