[Bug 653388] [NEW] 10.10 RC: serial8250: too much work for irq (Motorola SM56 modem, RS480, SB400)

[floid]

Public bug reported:

Previous attempt to file resulted in a Launchpad timeout and lost screed, so here's the "talk-like-the-Micro-Machines-guy" version:
10.10 RC i386 Linux ubuntu 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux

dmesg clogs with:
[  326.566996] serial8250: too much work for irq17
[  326.580318] serial8250: too much work for irq17
[  326.593635] serial8250: too much work for irq17
[  326.606966] serial8250: too much work for irq17
[  326.620285] serial8250: too much work for irq17
[  326.633606] serial8250: too much work for irq17
oddly only until:
[  335.695389] serial8250: too much work for irq17

Hardware:  Compaq SR1611NX desktop

Not a problem under 9.10 using 2.6.31-22-generic #65-Ubuntu SMP Thu Sep
16 15:48:58 UTC 2010 i686 GNU/Linux

All SR1611NXs put the modem, radeon, and AC97 controller on IRQ17;
Forum folklore suggests pulling the modem could be the mindless fix but that would be annoying across multiple machines.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
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:
 Cannot stat file /proc/4366/fd/40: Stale NFS file handle
                      USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ubuntu     2885 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'IXP'/'ATI IXP rev 2 with ALC658D at 0xfe02a000, irq 17'
   Mixer name	: 'Realtek ALC658D'
   Components	: 'AC97a:414c4781'
   Controls      : 38
   Simple ctrls  : 24
Date: Sat Oct  2 01:46:01 2010
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
LiveMediaBuild: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate i386 (20100928)
MachineType: Compaq Presario 061 ED866AA-ABA SR1611NX NA541
ProcCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
dmi.bios.date: 01/25/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 3.15
dmi.board.name: Amberine M
dmi.board.vendor: ASUSTek Computer INC.
dmi.board.version: 1.03
dmi.chassis.type: 3
dmi.chassis.version: 1111
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr3.15:bd01/25/2007:svnCompaqPresario061:pnED866AA-ABASR1611NXNA541:pvr0nx1411RE101AMBEM00:rvnASUSTekComputerINC.:rnAmberineM:rvr1.03:cvn:ct3:cvr1111:
dmi.product.name: ED866AA-ABA SR1611NX NA541
dmi.product.version: 0nx1411RE101AMBEM00
dmi.sys.vendor: Compaq Presario 061

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kernel-config maverick needs-upstream-testing regression-potential

-- 
10.10 RC: serial8250: too much work for irq (Motorola SM56 modem, RS480, SB400)
https://bugs.launchpad.net/bugs/653388
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