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[Edward Donovan <855199@xxxxxxxxxxxxxxxxxx>]

I think I've got it fixed.  I submitted a patch, so we'll see.

The problem commit added a test to the bad-irq routines, checking
whether they were already running.  One of these tests had an equal-to
operator, "==",  where it seems to need "!=", not equal.  Making that
one change in kernel/irq/spurious.c fixes the regression for me.  I've
tested it successfully it on various kernels, including the current
Oneiric source.

The submitted patch is attached.  And here it is on LKML, in (hopeful)
case anything happens there:

  https://lkml.org/lkml/2011/11/1/267

Please test if you can.  Thanks.


** Patch added: "Patch I submitted to LKML"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/855199/+attachment/2582068/+files/0001-genirq-spurious.c-fix-regression-that-broke-irqfixup.patch

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

Title:
  "irqfixup" and "irqpoll" broken since 2.6.39

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

Bug description:
  In all kernels since 2.6.39, the "irqfixup" and "irqpoll" options are
  no longer taking effect.  I have several machines that need to boot
  with one of these options, and I see reports of this regression from
  multiple other users.

  The interrupts now generate the same errors seen without these kernel
  options, e.g.:

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

  even though irqpoll, or irqfixup, is used.  I don't know whether these
  options fail in all cases, or if some unknown hardware configurations
  are out there continuing to work.

  The Linux irq code was reworked during the 2.6.39 cycle.  I have gone
  through the patches, and this is the commit where the regression
  arrives:

    commit d05c65fff0ef672be75429266751f0e015b54d94

    genirq: spurious: Run only one poller at a time

    No point in running concurrent pollers which confuse each other by
    setting PENDING.

    author Thomas Gleixner <tglx@xxxxxxxxxxxxx>
     Mon, 7 Feb 2011 13:31:37 +0000 (14:31 +0100)
    committer Thomas Gleixner <tglx@xxxxxxxxxxxxx>
     Sat, 19 Feb 2011 11:58:09 +0000 (12:58 +0100)

  http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=d05c65fff0ef672be75429266751f0e015b54d94

  I emailed LKML and Mr. Gleixner, who is the subsystem maintainer, but
  got no response to date.  (And the kernel bugzilla is still down.)  I
  had not isolated this single patch, out of the pile, then.  I'm trying
  to look the patch over, to improve my case, before my next try at
  getting maintainer attention.

  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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