gspca: ISOC data errors when using resolution of 640x480

[Vish]

Steps to reproduce:

1: Start cheese . Edit > Preferences
2: Select resolution 640x480

Observed deviation:
The picture is chopped and stutters.

I looked into the syslogs and notice the following errors:
Mar 21 20:45:12 vish-laptop kernel: [201728.075019] gspca: ISOC data error: [109] len=1024, status=-71
Mar 21 20:45:12 vish-laptop kernel: [201728.250991] gspca: ISOC data error: [111] len=1024, status=-71
Mar 21 20:45:13 vish-laptop kernel: [201728.970968] gspca: ISOC data error: [90] len=1024, status=-71
Mar 21 20:45:13 vish-laptop kernel: [201729.738920] gspca: ISOC data error: [66] len=1024, status=-71
Mar 21 20:45:14 vish-laptop kernel: [201730.042973] gspca: ISOC data error: [76] len=1024, status=-71
Mar 21 20:45:16 vish-laptop kernel: [201732.378992] gspca: ISOC data error: [113] len=1024, status=-71
Mar 21 20:45:16 vish-laptop kernel: [201732.490974] gspca: ISOC data error: [85] len=1024, status=-71
Mar 21 20:45:16 vish-laptop kernel: [201732.618994] gspca: ISOC data error: [97] len=1024, status=-71
Mar 21 20:45:18 vish-laptop kernel: [201733.803001] gspca: ISOC data error: [104] len=1024, status=-71
Mar 21 20:45:18 vish-laptop kernel: [201734.170933] gspca: ISOC data error: [74] len=1024, status=-71
Mar 21 20:45:18 vish-laptop kernel: [201734.458983] gspca: ISOC data error: [79] len=1024, status=-71
Mar 21 20:45:19 vish-laptop kernel: [201735.306788] gspca: ISOC data error: [0] len=1024, status=-71
Mar 21 20:45:19 vish-laptop kernel: [201735.434839] gspca: ISOC data error: [23] len=1024, status=-71
Mar 21 20:45:21 vish-laptop kernel: [201737.082937] gspca: ISOC data error: [79] len=1024, status=-71
Mar 21 20:45:21 vish-laptop kernel: [201737.450935] gspca: ISOC data error: [77] len=1024, status=-71

The numbers seems random , but this is constantly going on.

But when i select resolution of 320x240 , there is no problem and everything works fine[well the picture quality can be improved to the quality observed in Window ] but there are no errors in logs or the stutter/choppy picture

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: vishnoo 1298 F.... pulseaudio
 /dev/snd/pcmC0D0p: vishnoo 1298 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xc8000000 irq 22'
   Mixer name : 'Realtek ALC883'
   Components : 'HDA:10ec0883,1025160d,00100002 HDA:14f12bfa,10250094,00090000'
   Controls : 23
   Simple ctrls : 13
CheckboxSubmission: a488dc8580a64da042cc99114e54d55a
CheckboxSystem: 5484a8dd99f006173bd2ac53fa4837c2
Date: Sun Mar 21 20:39:41 2010
DistroRelease: Ubuntu 10.04
HibernationDevice: RESUME=UUID=87513ef2-a303-4082-94f3-352058dbd5ee
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20091209)
MachineType: Acer, inc. Aspire 5670
Package: linux-image-2.6.32-16-generic 2.6.32-16.25
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic root=UUID=3e905623-5a65-47ef-a1d0-d8fba363d773 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
Regression: No
RelatedPackageVersions: linux-firmware 1.33
Reproducible: Yes
SourcePackage: linux
TestedUpstream: No
Uname: Linux 2.6.32-16-generic i686
dmi.bios.date: 01/12/07
dmi.bios.vendor: Acer
dmi.bios.version: v1.3239
dmi.board.name: Bodensee
dmi.board.vendor: Acer, Inc.
dmi.board.version: Not Applicable
dmi.chassis.type: 1
dmi.chassis.vendor: Acer, Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvrv1.3239:bd01/12/07:svnAcer,inc.:pnAspire5670:pvrNotApplicable:rvnAcer,Inc.:rnBodensee:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A:
dmi.product.name: Aspire 5670
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer, inc.

[Jeremy Foshee (jeremyfoshee)]

Hi Vish,

This bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 543485

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[Vish (vish)]

Tested with 2 mainline kernels
- Kernel 2.6.33-02063303-generic , i notice the problem still exists. [however no logging of any events is going on , I'm not sure how to turn on the logging for that kernel, somehow *no* message is getting logged for this kernel this error or any other general logs]

- Kernel 2.6.34-999.201005121008 , the error occurrence is extremely rare and is logged .

With kernel .34 I'v noticed a drastic improvement in the picture quality, however there is also a drastic reduction in the video fps :(
Should I file a separate bug for this?

[Vish (vish)]

I'm closing my own bug report. This is an upstream issue , the webcam didnt have proper driver support.
The gspca author has contacted regarding this and I'm following up with the author on an upstream bug.