Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Tue, 9 Oct 2012 15:54:46 -0700
Jonathan Nieder jrnie...@gmail.com wrote:

 Hi,
 
 In June, Martin-Éric Racine wrote:
 
  Since recent kernels, this ASUS W5F's built-in webcam fails to be
  detected. Gstreamer-based applications (Cheese,
  gstreamer-properties) immediately crash whenever trying to access
  the video device.
 [...]
  video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error
  14 in cheese[8048000+21000]
 
 In July, Martin-Éric Racine wrote:
 
  As far as I can tell, yes, the modules in Jean-François' tarball work
  as-is to fix the problem.
 [...]
  [   11.834852] gspca_main: v2.15.18 registered
  [   11.844262] gspca_main: vc032x-2.15.18 probing 0ac8:0321
  [   11.844682] gspca_vc032x: vc0321 check sensor header 2c
  [   11.850304] gspca_vc032x: Sensor ID 3130 (0)
  [   11.850309] gspca_vc032x: Find Sensor PO3130NC
  [   11.851809] gspca_main: video0 created
 
  Backport would be needed against 3.2.21 as this is what Debian will
  (probably) release with.
 
 Sorry to have lost track of this.  Do you know what patch fixed it?
 Does 3.5.y from experimental work?
 
 Curious,
 Jonathan

Hi Jonathan,

I tried to prepare a patch set for the vc032x, but testing with
Martin-Éric stopped  mid-july, so I have nothing to propose yet. I'm
waiting for some other vc0321+po3130nc owner and continue the tests...

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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

Jean-Francois Moine wrote:

 I tried to prepare a patch set for the vc032x,

That's good to hear.  Does that you mean you have a rough patchset
available, even if it doesn't work perfectly yet?

I'd be happy to see some patches e.g. with [PATCH/WIP] in the subject
line so there is something for people listening in to experiment with.
Alternatively if they are not ready for testing or comments but should
go somewhere public in a less noisy way, if you send patches as
attachments to the bug log at 677533-qu...@bugs.debian.org then they
won't be forgotten.

Thanks,
Jonathan
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/10/10 Jean-Francois Moine moin...@free.fr:
 On Tue, 9 Oct 2012 15:54:46 -0700
 Jonathan Nieder jrnie...@gmail.com wrote:

 Hi,

 In June, Martin-Éric Racine wrote:

  Since recent kernels, this ASUS W5F's built-in webcam fails to be
  detected. Gstreamer-based applications (Cheese,
  gstreamer-properties) immediately crash whenever trying to access
  the video device.
 [...]
  video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error
  14 in cheese[8048000+21000]

 In July, Martin-Éric Racine wrote:

  As far as I can tell, yes, the modules in Jean-François' tarball work
  as-is to fix the problem.
 [...]
  [   11.834852] gspca_main: v2.15.18 registered
  [   11.844262] gspca_main: vc032x-2.15.18 probing 0ac8:0321
  [   11.844682] gspca_vc032x: vc0321 check sensor header 2c
  [   11.850304] gspca_vc032x: Sensor ID 3130 (0)
  [   11.850309] gspca_vc032x: Find Sensor PO3130NC
  [   11.851809] gspca_main: video0 created
 
  Backport would be needed against 3.2.21 as this is what Debian will
  (probably) release with.

 Sorry to have lost track of this.  Do you know what patch fixed it?
 Does 3.5.y from experimental work?

 Curious,
 Jonathan

 Hi Jonathan,

 I tried to prepare a patch set for the vc032x, but testing with
 Martin-Éric stopped  mid-july, so I have nothing to propose yet. I'm
 waiting for some other vc0321+po3130nc owner and continue the tests...

We kept on going back and forth between two versions of the same file,
none of which produced the result expected by Jean-Francois. I'd
venture that the change that fixed it involves an entirely different
file, but he seemed to expect otherwise.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

Hi,

In June, Martin-Éric Racine wrote:

 Since recent kernels, this ASUS W5F's built-in webcam fails to be
 detected. Gstreamer-based applications (Cheese,
 gstreamer-properties) immediately crash whenever trying to access
 the video device.
[...]
 video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error
 14 in cheese[8048000+21000]

In July, Martin-Éric Racine wrote:

 As far as I can tell, yes, the modules in Jean-François' tarball work
 as-is to fix the problem.
[...]
 [   11.834852] gspca_main: v2.15.18 registered
 [   11.844262] gspca_main: vc032x-2.15.18 probing 0ac8:0321
 [   11.844682] gspca_vc032x: vc0321 check sensor header 2c
 [   11.850304] gspca_vc032x: Sensor ID 3130 (0)
 [   11.850309] gspca_vc032x: Find Sensor PO3130NC
 [   11.851809] gspca_main: video0 created

 Backport would be needed against 3.2.21 as this is what Debian will
 (probably) release with.

Sorry to have lost track of this.  Do you know what patch fixed it?
Does 3.5.y from experimental work?

Curious,
Jonathan
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/10/10 Jonathan Nieder jrnie...@gmail.com:
 Hi,

 In June, Martin-Éric Racine wrote:

 Since recent kernels, this ASUS W5F's built-in webcam fails to be
 detected. Gstreamer-based applications (Cheese,
 gstreamer-properties) immediately crash whenever trying to access
 the video device.
 [...]
 video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error
 14 in cheese[8048000+21000]

 In July, Martin-Éric Racine wrote:

 As far as I can tell, yes, the modules in Jean-François' tarball work
 as-is to fix the problem.
 [...]
 [   11.834852] gspca_main: v2.15.18 registered
 [   11.844262] gspca_main: vc032x-2.15.18 probing 0ac8:0321
 [   11.844682] gspca_vc032x: vc0321 check sensor header 2c
 [   11.850304] gspca_vc032x: Sensor ID 3130 (0)
 [   11.850309] gspca_vc032x: Find Sensor PO3130NC
 [   11.851809] gspca_main: video0 created

 Backport would be needed against 3.2.21 as this is what Debian will
 (probably) release with.

 Sorry to have lost track of this.  Do you know what patch fixed it?
 Does 3.5.y from experimental work?

There is no known patch. What currently works is a whole new upstream
tarball of the GSPCA tree, built as a standalone module package. It's
not fixed in 3.5 however.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/10 Jean-Francois Moine moin...@free.fr:
 So, it would be interesting to know if the (almost) last driver works.
 Then, you may try the gspca-2.15.18.tar.gz from my web site:

 wget http://moinejf.free.fr/gspca-2.15.18.tar.gz
 tar -zxf gspca-2.15.18.tar.gz
 cd gspca-2.15.18
 make

$ LC_ALL=C make
make -C /lib/modules/3.5.0-rc6+/build
M=/home/perkelix/gspca-2.15.18/build modules
make: *** /lib/modules/3.5.0-rc6+/build: No such file or directory.  Stop.
make: *** [modules] Error 2

 su
 make install
 reboot

 You may then try cheese. For skype, don't forget to force the
 use of the v4l library:

 export LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so
 skype

I don't recall Skype having required this in a long time. As I already
said, until recently, the camera just worked.

 If the problem is still there, I'd be glad to get some traces.
 For that, as root, do:

 echo 0x1f  /sys/module/gspca_main/parameters/debug

 then, unplug/replug the webcam,

No can do; this is an internal webcam.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Wed, 11 Jul 2012 10:02:27 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:
[snip]
  wget http://moinejf.free.fr/gspca-2.15.18.tar.gz
  tar -zxf gspca-2.15.18.tar.gz
  cd gspca-2.15.18
  make
 
 $ LC_ALL=C make
 make -C /lib/modules/3.5.0-rc6+/build
 M=/home/perkelix/gspca-2.15.18/build modules
 make: *** /lib/modules/3.5.0-rc6+/build: No such file or directory.  Stop.
 make: *** [modules] Error 2

You need the linux headers of your running kernel to compile the tarball.

[snip]
 I don't recall Skype having required this in a long time. As I already
 said, until recently, the camera just worked.

Good news!

[snip]
  echo 0x1f  /sys/module/gspca_main/parameters/debug
 
  then, unplug/replug the webcam,
 
 No can do; this is an internal webcam.

No problem. As I want to know the sensor type, instead of cutting the
kernel messages starting from the webcam probe, please, filter them by
something like:

dmesg | fgrep gspca  gspca.txt

Thanks.
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/11 Jean-Francois Moine moin...@free.fr:
 On Wed, 11 Jul 2012 10:02:27 +0300
 Martin-Éric Racine martin-eric.rac...@iki.fi wrote:
 [snip]
  wget http://moinejf.free.fr/gspca-2.15.18.tar.gz
  tar -zxf gspca-2.15.18.tar.gz
  cd gspca-2.15.18
  make

 $ LC_ALL=C make
 make -C /lib/modules/3.5.0-rc6+/build
 M=/home/perkelix/gspca-2.15.18/build modules
 make: *** /lib/modules/3.5.0-rc6+/build: No such file or directory.  Stop.
 make: *** [modules] Error 2

 You need the linux headers of your running kernel to compile the tarball.

I installed them. That still doesn't fix it:

$ LC_ALL=C make
make -C /lib/modules/3.5.0-rc6+/build
M=/home/perkelix/gspca-2.15.18/build modules
make[1]: Entering directory `/usr/src/linux-headers-3.5.0-rc6+'
/usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile:39:
/usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile_32.cpu: No such
file or directory
make[1]: *** No rule to make target
`/usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile_32.cpu'.  Stop.
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
make: *** [modules] Error 2

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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Wed, 11 Jul 2012 13:21:55 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

 I installed them. That still doesn't fix it:
 
 $ LC_ALL=C make
 make -C /lib/modules/3.5.0-rc6+/build
 M=/home/perkelix/gspca-2.15.18/build modules
 make[1]: Entering directory `/usr/src/linux-headers-3.5.0-rc6+'
 /usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile:39:
 /usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile_32.cpu: No such
 file or directory
 make[1]: *** No rule to make target

Strange. The file arch/x86/Makefile_32.cpu is in the linux 3.5.0 tree.
It should have been forgotten in the Debian package. You may copy it
from any other kernel source/header you have.

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Jef |   http://moinejf.free.fr/
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/11 Jean-Francois Moine moin...@free.fr:
 On Wed, 11 Jul 2012 13:21:55 +0300
 Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

 I installed them. That still doesn't fix it:

 $ LC_ALL=C make
 make -C /lib/modules/3.5.0-rc6+/build
 M=/home/perkelix/gspca-2.15.18/build modules
 make[1]: Entering directory `/usr/src/linux-headers-3.5.0-rc6+'
 /usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile:39:
 /usr/src/linux-headers-3.5.0-rc6+/arch/x86/Makefile_32.cpu: No such
 file or directory
 make[1]: *** No rule to make target

 Strange. The file arch/x86/Makefile_32.cpu is in the linux 3.5.0 tree.
 It should have been forgotten in the Debian package. You may copy it
 from any other kernel source/header you have.

That would be a bug in upstream GIT's built-in support for producing
Debian packages then.

Anyhow, after copying the missing file, the build successfully
launches then breaks as follow:

  CC [M]  /home/perkelix/gspca-2.15.18/build/ov534_9.o
/home/perkelix/gspca-2.15.18/build/ov534_9.c: In function ‘sd_init’:
/home/perkelix/gspca-2.15.18/build/ov534_9.c:1353:3: error: implicit
declaration of function ‘err’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[2]: *** [/home/perkelix/gspca-2.15.18/build/ov534_9.o] Virhe 1
make[1]: *** [_module_/home/perkelix/gspca-2.15.18/build] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
make: *** [modules] Error 2

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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Wed, 11 Jul 2012 14:14:24 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

   CC [M]  /home/perkelix/gspca-2.15.18/build/ov534_9.o
 /home/perkelix/gspca-2.15.18/build/ov534_9.c: In function ‘sd_init’:
 /home/perkelix/gspca-2.15.18/build/ov534_9.c:1353:3: error: implicit
 declaration of function ‘err’ [-Werror=implicit-function-declaration]
 cc1: some warnings being treated as errors
 make[2]: *** [/home/perkelix/gspca-2.15.18/build/ov534_9.o] Virhe 1
 make[1]: *** [_module_/home/perkelix/gspca-2.15.18/build] Error 2
 make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
 make: *** [modules] Error 2

Sorry, I did not compile yet with kernel = 3.4.

So, please, edit the file build/ov534_9.c (and possibly other sources),
changing  the calls to 'err' to 'pr_err'.

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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/11 Jean-Francois Moine moin...@free.fr:
 On Wed, 11 Jul 2012 14:14:24 +0300
 Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

   CC [M]  /home/perkelix/gspca-2.15.18/build/ov534_9.o
 /home/perkelix/gspca-2.15.18/build/ov534_9.c: In function ‘sd_init’:
 /home/perkelix/gspca-2.15.18/build/ov534_9.c:1353:3: error: implicit
 declaration of function ‘err’ [-Werror=implicit-function-declaration]
 cc1: some warnings being treated as errors
 make[2]: *** [/home/perkelix/gspca-2.15.18/build/ov534_9.o] Virhe 1
 make[1]: *** [_module_/home/perkelix/gspca-2.15.18/build] Error 2
 make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
 make: *** [modules] Error 2

 Sorry, I did not compile yet with kernel = 3.4.

 So, please, edit the file build/ov534_9.c (and possibly other sources),
 changing  the calls to 'err' to 'pr_err'.

This was was required for both build/ov534_9.c and build/spca505.c to
build agaist 3.5.

Sure enough, this seems to fix support for this camera in both Cheese
and Skype. Hurray! :-)

Now, the only thing that remains is for this to be merged in the 3.5
tree, then backported to the 3.2 tree that is used for Debian's
upcoming Wheezy stable release (and for Ubuntu's recently released
Precise also).

Thanks again to everyone for the hand-holding!

Cheers!
Martin-Éric

PS: Jonathan, do you feel like investigating why
arch/x86/Makefile_32.cpu wasn't included in the
linux-headers-3.5.0-rc6+_3.5.0-rc6+-1_i386.deb package that was
generated by the 'make deb-pkg' target?
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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

Martin-Éric Racine wrote:

 PS: Jonathan, do you feel like investigating why
 arch/x86/Makefile_32.cpu wasn't included in the
 linux-headers-3.5.0-rc6+_3.5.0-rc6+-1_i386.deb package that was
 generated by the 'make deb-pkg' target?

MAINTAINERS tells me that linux-kbu...@vger.kernel.org is the list
to contact.  You might also want to cc the kernel team at
debian-ker...@lists.debian.org since there are likely to be some
familiar people among them.
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Re: video: USB webcam fails since kernel 3.2

[Hans de Goede]

Hi,

On 07/11/2012 02:01 PM, Martin-Éric Racine wrote:

2012/7/11 Jean-Francois Moine moin...@free.fr:

On Wed, 11 Jul 2012 14:14:24 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:


   CC [M]  /home/perkelix/gspca-2.15.18/build/ov534_9.o
/home/perkelix/gspca-2.15.18/build/ov534_9.c: In function ‘sd_init’:
/home/perkelix/gspca-2.15.18/build/ov534_9.c:1353:3: error: implicit
declaration of function ‘err’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[2]: *** [/home/perkelix/gspca-2.15.18/build/ov534_9.o] Virhe 1
make[1]: *** [_module_/home/perkelix/gspca-2.15.18/build] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
make: *** [modules] Error 2


Sorry, I did not compile yet with kernel = 3.4.

So, please, edit the file build/ov534_9.c (and possibly other sources),
changing  the calls to 'err' to 'pr_err'.


This was was required for both build/ov534_9.c and build/spca505.c to
build agaist 3.5.

Sure enough, this seems to fix support for this camera in both Cheese
and Skype. Hurray! :-)


Ok, so it seems that increasing the bandwidth we claim for the camera
(which is what my suggested return 2000 * 2000 * 120; change does, helps
a bit, where as the changes to vc032x which are in Jean-Francois Moine's
gspca-2.15.18 tarbal fix the problem entirely, correct?



Now, the only thing that remains is for this to be merged in the 3.5
tree, then backported to the 3.2 tree that is used for Debian's
upcoming Wheezy stable release (and for Ubuntu's recently released
Precise also).


Well we first need to turn the changes made in gspca-2.15.18 into
a patch will which apply to the latest gspca tree:
http://git.linuxtv.org/hgoede/gspca.git/shortlog/refs/heads/media-for_v3.6

And then apply them there, before the can be backported to older
kernels. Unfortunately I'm leaving for a week vacation Friday, and I
probably won't get around to this before then.

Jean-Francois, can you perhaps make a patch against my latest tree for
the po / PO3130 changes in your tarbal?

Regards,

Hans
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/11 Hans de Goede hdego...@redhat.com:
 On 07/11/2012 02:01 PM, Martin-Éric Racine wrote:

 2012/7/11 Jean-Francois Moine moin...@free.fr:

 On Wed, 11 Jul 2012 14:14:24 +0300
 Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

CC [M]  /home/perkelix/gspca-2.15.18/build/ov534_9.o
 /home/perkelix/gspca-2.15.18/build/ov534_9.c: In function ‘sd_init’:
 /home/perkelix/gspca-2.15.18/build/ov534_9.c:1353:3: error: implicit
 declaration of function ‘err’ [-Werror=implicit-function-declaration]
 cc1: some warnings being treated as errors
 make[2]: *** [/home/perkelix/gspca-2.15.18/build/ov534_9.o] Virhe 1
 make[1]: *** [_module_/home/perkelix/gspca-2.15.18/build] Error 2
 make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-rc6+'
 make: *** [modules] Error 2


 Sorry, I did not compile yet with kernel = 3.4.

 So, please, edit the file build/ov534_9.c (and possibly other sources),
 changing  the calls to 'err' to 'pr_err'.


 This was was required for both build/ov534_9.c and build/spca505.c to
 build agaist 3.5.

 Sure enough, this seems to fix support for this camera in both Cheese
 and Skype. Hurray! :-)


 Ok, so it seems that increasing the bandwidth we claim for the camera
 (which is what my suggested return 2000 * 2000 * 120; change does, helps
 a bit, where as the changes to vc032x which are in Jean-Francois Moine's
 gspca-2.15.18 tarbal fix the problem entirely, correct?

As far as I can tell, yes, the modules in Jean-François' tarball work
as-is to fix the problem.

 Now, the only thing that remains is for this to be merged in the 3.5
 tree, then backported to the 3.2 tree that is used for Debian's
 upcoming Wheezy stable release (and for Ubuntu's recently released
 Precise also).


 Well we first need to turn the changes made in gspca-2.15.18 into
 a patch will which apply to the latest gspca tree:
 http://git.linuxtv.org/hgoede/gspca.git/shortlog/refs/heads/media-for_v3.6

 And then apply them there, before the can be backported to older
 kernels. Unfortunately I'm leaving for a week vacation Friday, and I
 probably won't get around to this before then.

 Jean-Francois, can you perhaps make a patch against my latest tree for
 the po / PO3130 changes in your tarbal?

Noted.  Hopefully, the Debian kernel team can contribute to the
backporting part, since it's needed for the upcoming stable release.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Wed, 11 Jul 2012 16:43:47 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

  Jean-Francois, can you perhaps make a patch against my latest tree for
  the po / PO3130 changes in your tarbal?  
 
 Noted.  Hopefully, the Debian kernel team can contribute to the
 backporting part, since it's needed for the upcoming stable release.

I had many problems with the vc032x driver, and the source code is very
different from the code in the official kernels.

As I have no webcam, Martin-Éric, may I ask you to test the backport
I will do? It will be done only in the vc032x driver, so you could keep
the working gspca_vc032x.ko file you have and restore it between the
tests. I still lack the sensor type of your webcam. May you send me the
result of:

dmesg | fgrep gspca

I'll contact you directly (with copy to Hans de Goede) as soon as I
will have something to propose.

Thanks by advance.

-- 
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Jef |   http://moinejf.free.fr/
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/11 Jean-Francois Moine moin...@free.fr:
 On Wed, 11 Jul 2012 16:43:47 +0300
 Martin-Éric Racine martin-eric.rac...@iki.fi wrote:

  Jean-Francois, can you perhaps make a patch against my latest tree for
  the po / PO3130 changes in your tarbal?

 Noted.  Hopefully, the Debian kernel team can contribute to the
 backporting part, since it's needed for the upcoming stable release.

 I had many problems with the vc032x driver, and the source code is very
 different from the code in the official kernels.

 As I have no webcam, Martin-Éric, may I ask you to test the backport
 I will do? It will be done only in the vc032x driver, so you could keep
 the working gspca_vc032x.ko file you have and restore it between the
 tests. I still lack the sensor type of your webcam. May you send me the
 result of:

 dmesg | fgrep gspca

[   11.834852] gspca_main: v2.15.18 registered
[   11.844262] gspca_main: vc032x-2.15.18 probing 0ac8:0321
[   11.844682] gspca_vc032x: vc0321 check sensor header 2c
[   11.850304] gspca_vc032x: Sensor ID 3130 (0)
[   11.850309] gspca_vc032x: Find Sensor PO3130NC
[   11.851809] gspca_main: video0 created

Backport would be needed against 3.2.21 as this is what Debian will
(probably) release with.

Cheers!
Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

Hi Jonathan,

Thank you for these detailed instructions. Find the results of my testing below:

2012/7/9 Jonathan Nieder jrnie...@gmail.com:
 Hans de Goede wrote:

 Erm, that is quite a bit of work from my side for something which you
 can easily do yourself, edit gspca.c, search for which_bandwidth
 and then under the following lines:
 u32 bandwidth;
 int i;

 Add a line like this:
   return 2000 * 2000 * 120;

 In case it helps, here are some more complete instructions.

  0. Prerequisites:

 apt-get install git build-essential

  1. Get the kernel history, if you don't already have it:

 git clone \
   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Cloned up to the following commit:

commit 2437fccfbfc83bcb868ccc7fdfe2b5310bf07835
Merge: 6c6ee53 d92d95b6
Author: Linus Torvalds torva...@linux-foundation.org
Date:   Mon Jul 9 13:43:02 2012 -0700

Merge tag 'regulator-3.5' of
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator

  2. Try linus's master:

 cd linux
 git fetch origin
 git reset --hard origin/master
 cp /boot/config-$(uname -r) .config; # current configuration
 scripts/config --disable DEBUG_INFO
 make localmodconfig; # optional: minimize configuration
 make deb-pkg; # optionally with -jnum for parallel build
 dpkg -i ../name of package; # as root
 reboot
 ... test test test ...

 Hopefully it reproduces the bug.

Fails as previously.

  3. Try Hans's first suggested change, as described in the quoted text
 above:

/* compute the minimum bandwidth for the current transfer */
static u32 which_bandwidth(struct gspca_dev *gspca_dev)
{
u32 bandwidth;
int i;

return 2000 * 2000 * 120;

/* get the (max) image size */

 cd linux
 vi drivers/media/video/gspca/gspca.c
 ... make the suggested edits ...
 make deb-pkg; # maybe with -j4
 dpkg -i ../name of package; # as root
 reboot
 ... test test test ...

The camera works again in Cheese, at least some of the time. Other
times, launching Cheese immediately crashes GNOME, which restarts the
X.org server.

However, with Skype 4.0.0.7, it only shows a green square, instead of
the camera's output.

  4. Try Hans's second suggested change, as described in a previous
 message:

 cd linux
 vi drivers/media/video/gspca/gspca.c
 ... make the suggested edits ...
 make deb-pkg; # maybe with -j4
 dpkg -i ../name of package; # as root
 reboot
 ... test test test ...

This produces a severely distorted image for a few seconds, then
Cheese crashes; GNOME itself survives.

Meanwhile, Skype 4.0.0.7 shows a black square, instead of the camera's output.

I hope that the above already provides some usable answers.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Tue, 10 Jul 2012 15:56:08 +0300
Martin-Éric Racine martin-eric.rac...@iki.fi wrote:
[snip]
 I hope that the above already provides some usable answers.

Not a lot :(

Well, I already saw these errors -71. One case was a cable problem.
An other one occurred with skype only, while vlc worked correctly.

So, it would be interesting to know if the (almost) last driver works.
Then, you may try the gspca-2.15.18.tar.gz from my web site:

wget http://moinejf.free.fr/gspca-2.15.18.tar.gz
tar -zxf gspca-2.15.18.tar.gz
cd gspca-2.15.18
make
su
make install
reboot

You may then try cheese. For skype, don't forget to force the
use of the v4l library:

export LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so
skype

If the problem is still there, I'd be glad to get some traces.
For that, as root, do:

echo 0x1f  /sys/module/gspca_main/parameters/debug

then, unplug/replug the webcam, do some capture until the problem
occurs, and send us the last kernel messages starting from the webcam
probe.

Thanks.

-- 
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Jef |   http://moinejf.free.fr/
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Re: video: USB webcam fails since kernel 3.2

[Hans de Goede]

Hi,

On 07/08/2012 08:33 PM, Jean-Francois Moine wrote:

On Sun, 08 Jul 2012 19:58:08 +0200
Hans de Goede hdego...@redhat.com wrote:


Hmm, this is then likely caused by the new isoc bandwidth negotiation code
in 3.2, unfortunately the vc032x driver is one of the few gspca drivers
for which I don't have a cam to test with. Can you try to build your own
kernel from source?


Hi Martin-Éric,

Instead of re-building the gspca driver from a kernel source, you may
try the gspca test tarball from my web site
http://moinejf.free.fr/gspca-2.15.18.tar.gz


That is a good option too and easier then building a whole new kernel,
but:


It contains most of the bug fixes, including the one about the
bandwidth problem.


Right, but the problem with the vc032x driver is that there no bandwidth
related bugfix for it yet, which is why I asked Martin-Éric, not only
to build a new gspca driver from source, but also to try some modifications.

Martin-Éric,

Building the gspca test-tarbal also is a good way to test this:
http://moinejf.free.fr/gspca-2.15.18.tar.gz

But once you've confirmed the problem still happens with that version
you will still need to try the changes I suggested to gspca.c to help
us confirm that this is a bandwidth issue and try to come up with a fix.

Thanks  Regards,

Hans
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/7/8 Hans de Goede hdego...@redhat.com:
 On 07/08/2012 03:01 PM, Martin-Éric Racine wrote:

 2012/6/17 Martin-Éric Racine martin-eric.rac...@iki.fi:

 pe, 2012-06-15 kello 23:41 -0500, Jonathan Nieder kirjoitti:

 Martin-Éric Racine wrote:

 usb 1-7: new high-speed USB device number 3 using ehci_hcd

 [...]

 usb 1-7: New USB device found, idVendor=0ac8, idProduct=0321
 usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
 usb 1-7: Product: USB2.0 Web Camera
 usb 1-7: Manufacturer: Vimicro Corp.

 [...]

 Linux media interface: v0.10
 Linux video capture interface: v2.00
 gspca_main: v2.14.0 registered
 gspca_main: vc032x-2.14.0 probing 0ac8:0321
 usbcore: registered new interface driver vc032x


 The device of interest is discovered.

 gspca_main: ISOC data error: [36] len=0, status=-71
 gspca_main: ISOC data error: [65] len=0, status=-71

 [...]

 gspca_main: ISOC data error: [48] len=0, status=-71
 video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14
 in cheese[8048000+21000]
 gspca_main: ISOC data error: [17] len=0, status=-71


 (The above data error spew starts around t=121 seconds and continues
 at a rate of about 15 messages per second.  The segfault is around
 t=154.)


 The vc032x code hasn't changed since 3.4.1, so please report your
 symptoms to Jean-François Moine moin...@free.fr, cc-ing
 linux-media@vger.kernel.org, linux-ker...@vger.kernel.org, and either
 me or this bug log so we can track it.  Be sure to mention:

   - steps to reproduce, expected result, actual result, and how the
 difference indicates a bug (should be simple enough in this case)


 1. Ensure that user 'myself' is a member of the 'video' group.
 2. Launch the webcam application Cheese from the GNOME desktop.

 Expected result: Cheese displays whatever this laptop's camera sees.

 Actual result: Cheese crashes while attempting to access the camera.

   - how reproducible the bug is (100%?)


 100%

   - which kernel versions you have tested and result with each (what is
 the newest kernel version that worked?)


 It probably was 3.1.0 or some earlier 3.2 release (the upcoming Debian
 will release with 3.2.x; 3.4 was only used here for testing purposes),
 but I wouldn't know for sure since I don't use my webcam too often.


 I finally found time to perform further testing, using kernel packages
 from snapshots.debian.org, and the last one that positively worked (at
 least using GNOME's webcam application Cheese) was:

 linux-image-3.1.0-1-686-pae  3.1.8-2
   Linux 3.1 for modern PCs

 This loaded the following video modules:

 gspca_vc032x
 gspca_main
 videodev
 media

 Tests using 3.2.1-1 or more recent crashed as described before. This
 at least gives us a time frame for when the regression started.


 Hmm, this is then likely caused by the new isoc bandwidth negotiation code
 in 3.2, unfortunately the vc032x driver is one of the few gspca drivers
 for which I don't have a cam to test with. Can you try to build your own
 kernel from source?

 Boot into your own kernel, and verify the regression is still there,
 then edit drivers/media/video/gspca/gspca.c and go to the which_bandwidth
 function, and at the beginning of this function add the following line:

 return 2000 * 2000 * 120;

 Then rebuild and re-install the kernel and try again.

 If that helps, remove the added
 return 2000 * 2000 * 120;
 line, and also remove the following lines from which_bandwidth:

 /* if the image is compressed, estimate its mean size */
 if (!gspca_dev-cam.needs_full_bandwidth 
 bandwidth  gspca_dev-cam.cam_mode[i].width *
 gspca_dev-cam.cam_mode[i].height)
 bandwidth = bandwidth * 3 / 8;  /* 0.375 */

 And try again if things still work this way.

 Once you've tested this I can try to write a fix for this.

Hans,

Thank you for your reply.

Just to eliminate the possibility of mistakes on my part while trying
to perform the above changes, could you send me a patch against Linux
3.2.21 that I could apply as-is, before building myself a test kernel
package?

Cheers!
Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Hans de Goede]

Hi,

On 07/09/2012 01:33 PM, Martin-Éric Racine wrote:

snip


Hmm, this is then likely caused by the new isoc bandwidth negotiation code
in 3.2, unfortunately the vc032x driver is one of the few gspca drivers
for which I don't have a cam to test with. Can you try to build your own
kernel from source?

Boot into your own kernel, and verify the regression is still there,
then edit drivers/media/video/gspca/gspca.c and go to the which_bandwidth
function, and at the beginning of this function add the following line:

return 2000 * 2000 * 120;

Then rebuild and re-install the kernel and try again.

If that helps, remove the added
return 2000 * 2000 * 120;
line, and also remove the following lines from which_bandwidth:

 /* if the image is compressed, estimate its mean size */
 if (!gspca_dev-cam.needs_full_bandwidth 
 bandwidth  gspca_dev-cam.cam_mode[i].width *
 gspca_dev-cam.cam_mode[i].height)
 bandwidth = bandwidth * 3 / 8;  /* 0.375 */

And try again if things still work this way.

Once you've tested this I can try to write a fix for this.


Hans,

Thank you for your reply.

Just to eliminate the possibility of mistakes on my part while trying
to perform the above changes, could you send me a patch against Linux
3.2.21 that I could apply as-is, before building myself a test kernel
package?


Erm, that is quite a bit of work from my side for something which you
can easily do yourself, edit gspca.c, search for which_bandwidth
and then under the following lines:
u32 bandwidth;
int i;

Add a line like this:
return 2000 * 2000 * 120;

Regards,

Hans
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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

Hi Martin-Éric,

Hans de Goede wrote:

 Erm, that is quite a bit of work from my side for something which you
 can easily do yourself, edit gspca.c, search for which_bandwidth
 and then under the following lines:
 u32 bandwidth;
 int i;

 Add a line like this:
   return 2000 * 2000 * 120;

In case it helps, here are some more complete instructions.

 0. Prerequisites:

apt-get install git build-essential

 1. Get the kernel history, if you don't already have it:

git clone \
  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. Try linus's master:

cd linux
git fetch origin
git reset --hard origin/master
cp /boot/config-$(uname -r) .config; # current configuration
scripts/config --disable DEBUG_INFO
make localmodconfig; # optional: minimize configuration
make deb-pkg; # optionally with -jnum for parallel build
dpkg -i ../name of package; # as root
reboot
... test test test ...

Hopefully it reproduces the bug.

 3. Try Hans's first suggested change, as described in the quoted text
above:

cd linux
vi drivers/media/video/gspca/gspca.c
... make the suggested edits ...
make deb-pkg; # maybe with -j4
dpkg -i ../name of package; # as root
reboot
... test test test ...

 4. Try Hans's second suggested change, as described in a previous
message:

cd linux
vi drivers/media/video/gspca/gspca.c
... make the suggested edits ...
make deb-pkg; # maybe with -j4
dpkg -i ../name of package; # as root
reboot
... test test test ...

No doubt Jean-François will notice that it is easier to test the
standalone driver because the first build does not have to compile the
whole kernel.  That's fine, too.  The instructions above describe how
to test the in-kernel driver because it's what I'm used to (and
because it means you test the driver against the same version of the
rest of the kernel as would get the fix).

Hope that helps,
Jonathan
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

2012/6/17 Martin-Éric Racine martin-eric.rac...@iki.fi:
 pe, 2012-06-15 kello 23:41 -0500, Jonathan Nieder kirjoitti:
 Martin-Éric Racine wrote:
  usb 1-7: new high-speed USB device number 3 using ehci_hcd
 [...]
  usb 1-7: New USB device found, idVendor=0ac8, idProduct=0321
  usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  usb 1-7: Product: USB2.0 Web Camera
  usb 1-7: Manufacturer: Vimicro Corp.
 [...]
  Linux media interface: v0.10
  Linux video capture interface: v2.00
  gspca_main: v2.14.0 registered
  gspca_main: vc032x-2.14.0 probing 0ac8:0321
  usbcore: registered new interface driver vc032x

 The device of interest is discovered.

  gspca_main: ISOC data error: [36] len=0, status=-71
  gspca_main: ISOC data error: [65] len=0, status=-71
 [...]
  gspca_main: ISOC data error: [48] len=0, status=-71
  video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in 
  cheese[8048000+21000]
  gspca_main: ISOC data error: [17] len=0, status=-71

 (The above data error spew starts around t=121 seconds and continues
 at a rate of about 15 messages per second.  The segfault is around
 t=154.)

 The vc032x code hasn't changed since 3.4.1, so please report your
 symptoms to Jean-François Moine moin...@free.fr, cc-ing
 linux-media@vger.kernel.org, linux-ker...@vger.kernel.org, and either
 me or this bug log so we can track it.  Be sure to mention:

  - steps to reproduce, expected result, actual result, and how the
difference indicates a bug (should be simple enough in this case)

 1. Ensure that user 'myself' is a member of the 'video' group.
 2. Launch the webcam application Cheese from the GNOME desktop.

 Expected result: Cheese displays whatever this laptop's camera sees.

 Actual result: Cheese crashes while attempting to access the camera.

  - how reproducible the bug is (100%?)

 100%

  - which kernel versions you have tested and result with each (what is
the newest kernel version that worked?)

 It probably was 3.1.0 or some earlier 3.2 release (the upcoming Debian
 will release with 3.2.x; 3.4 was only used here for testing purposes),
 but I wouldn't know for sure since I don't use my webcam too often.

I finally found time to perform further testing, using kernel packages
from snapshots.debian.org, and the last one that positively worked (at
least using GNOME's webcam application Cheese) was:

linux-image-3.1.0-1-686-pae  3.1.8-2
 Linux 3.1 for modern PCs

This loaded the following video modules:

gspca_vc032x
gspca_main
videodev
media

Tests using 3.2.1-1 or more recent crashed as described before. This
at least gives us a time frame for when the regression started.

Martin-Éric
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Re: video: USB webcam fails since kernel 3.2

[Hans de Goede]

Hi,

On 07/08/2012 03:01 PM, Martin-Éric Racine wrote:

2012/6/17 Martin-Éric Racine martin-eric.rac...@iki.fi:

pe, 2012-06-15 kello 23:41 -0500, Jonathan Nieder kirjoitti:

Martin-Éric Racine wrote:

usb 1-7: new high-speed USB device number 3 using ehci_hcd

[...]

usb 1-7: New USB device found, idVendor=0ac8, idProduct=0321
usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-7: Product: USB2.0 Web Camera
usb 1-7: Manufacturer: Vimicro Corp.

[...]

Linux media interface: v0.10
Linux video capture interface: v2.00
gspca_main: v2.14.0 registered
gspca_main: vc032x-2.14.0 probing 0ac8:0321
usbcore: registered new interface driver vc032x


The device of interest is discovered.


gspca_main: ISOC data error: [36] len=0, status=-71
gspca_main: ISOC data error: [65] len=0, status=-71

[...]

gspca_main: ISOC data error: [48] len=0, status=-71
video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in 
cheese[8048000+21000]
gspca_main: ISOC data error: [17] len=0, status=-71


(The above data error spew starts around t=121 seconds and continues
at a rate of about 15 messages per second.  The segfault is around
t=154.)



The vc032x code hasn't changed since 3.4.1, so please report your
symptoms to Jean-François Moine moin...@free.fr, cc-ing
linux-media@vger.kernel.org, linux-ker...@vger.kernel.org, and either
me or this bug log so we can track it.  Be sure to mention:

  - steps to reproduce, expected result, actual result, and how the
difference indicates a bug (should be simple enough in this case)


1. Ensure that user 'myself' is a member of the 'video' group.
2. Launch the webcam application Cheese from the GNOME desktop.

Expected result: Cheese displays whatever this laptop's camera sees.

Actual result: Cheese crashes while attempting to access the camera.


  - how reproducible the bug is (100%?)


100%


  - which kernel versions you have tested and result with each (what is
the newest kernel version that worked?)


It probably was 3.1.0 or some earlier 3.2 release (the upcoming Debian
will release with 3.2.x; 3.4 was only used here for testing purposes),
but I wouldn't know for sure since I don't use my webcam too often.


I finally found time to perform further testing, using kernel packages
from snapshots.debian.org, and the last one that positively worked (at
least using GNOME's webcam application Cheese) was:

linux-image-3.1.0-1-686-pae  3.1.8-2
  Linux 3.1 for modern PCs

This loaded the following video modules:

gspca_vc032x
gspca_main
videodev
media

Tests using 3.2.1-1 or more recent crashed as described before. This
at least gives us a time frame for when the regression started.


Hmm, this is then likely caused by the new isoc bandwidth negotiation code
in 3.2, unfortunately the vc032x driver is one of the few gspca drivers
for which I don't have a cam to test with. Can you try to build your own
kernel from source?

Boot into your own kernel, and verify the regression is still there,
then edit drivers/media/video/gspca/gspca.c and go to the which_bandwidth
function, and at the beginning of this function add the following line:

return 2000 * 2000 * 120;

Then rebuild and re-install the kernel and try again.

If that helps, remove the added
return 2000 * 2000 * 120;
line, and also remove the following lines from which_bandwidth:

/* if the image is compressed, estimate its mean size */
if (!gspca_dev-cam.needs_full_bandwidth 
bandwidth  gspca_dev-cam.cam_mode[i].width *
gspca_dev-cam.cam_mode[i].height)
bandwidth = bandwidth * 3 / 8;  /* 0.375 */

And try again if things still work this way.

Once you've tested this I can try to write a fix for this.

Regards,

Hans
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Re: video: USB webcam fails since kernel 3.2

[Jean-Francois Moine]

On Sun, 08 Jul 2012 19:58:08 +0200
Hans de Goede hdego...@redhat.com wrote:

 Hmm, this is then likely caused by the new isoc bandwidth negotiation code
 in 3.2, unfortunately the vc032x driver is one of the few gspca drivers
 for which I don't have a cam to test with. Can you try to build your own
 kernel from source?

Hi Martin-Éric,

Instead of re-building the gspca driver from a kernel source, you may
try the gspca test tarball from my web site
http://moinejf.free.fr/gspca-2.15.18.tar.gz
It contains most of the bug fixes, including the one about the
bandwidth problem.

-- 
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef |   http://moinejf.free.fr/
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Re: video: USB webcam fails since kernel 3.2

[Martin-Éric Racine]

pe, 2012-06-15 kello 23:41 -0500, Jonathan Nieder kirjoitti:
 Martin-Éric Racine wrote:
  usb 1-7: new high-speed USB device number 3 using ehci_hcd
 [...]
  usb 1-7: New USB device found, idVendor=0ac8, idProduct=0321
  usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  usb 1-7: Product: USB2.0 Web Camera
  usb 1-7: Manufacturer: Vimicro Corp.
 [...]
  Linux media interface: v0.10
  Linux video capture interface: v2.00
  gspca_main: v2.14.0 registered
  gspca_main: vc032x-2.14.0 probing 0ac8:0321
  usbcore: registered new interface driver vc032x
 
 The device of interest is discovered.
 
  gspca_main: ISOC data error: [36] len=0, status=-71
  gspca_main: ISOC data error: [65] len=0, status=-71
 [...]
  gspca_main: ISOC data error: [48] len=0, status=-71
  video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in 
  cheese[8048000+21000]
  gspca_main: ISOC data error: [17] len=0, status=-71
 
 (The above data error spew starts around t=121 seconds and continues
 at a rate of about 15 messages per second.  The segfault is around
 t=154.)
 
 The vc032x code hasn't changed since 3.4.1, so please report your
 symptoms to Jean-François Moine moin...@free.fr, cc-ing
 linux-media@vger.kernel.org, linux-ker...@vger.kernel.org, and either
 me or this bug log so we can track it.  Be sure to mention:
 
  - steps to reproduce, expected result, actual result, and how the
difference indicates a bug (should be simple enough in this case)

1. Ensure that user 'myself' is a member of the 'video' group.
2. Launch the webcam application Cheese from the GNOME desktop.

Expected result: Cheese displays whatever this laptop's camera sees.

Actual result: Cheese crashes while attempting to access the camera.

  - how reproducible the bug is (100%?)

100%

  - which kernel versions you have tested and result with each (what is
the newest kernel version that worked?)

It probably was 3.1.0 or some earlier 3.2 release (the upcoming Debian
will release with 3.2.x; 3.4 was only used here for testing purposes),
but I wouldn't know for sure since I don't use my webcam too often.

  - a log from booting and reproducing the bug, or a link to one

See http://bugs.debian.org/677533 

  - any other weird symptoms or observations

When testing the camera using the closed-source Skype 4.x compiled for
Debian, the video preferences dialog shows that a USB 2.0 camera is
found at /dev/video0. However, no image is shown. This would confirm the
assumption that the issue lies with the kernel video driver, rather than
with the Gstreamer framework that Cheese uses to access the camera.

 Hopefully someone upstream will have ideas for commands to run or
 patches to apply to further track down the cause.

Let's indeed hope so. Thanks for providing these instructions!

Regards,
Martin-Éric

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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

(cc-ing Hans de Goede, the new gspca maintainer.  Sorry I missed that before.)

 Martin-Éric Racine wrote:
 usb 1-7: new high-speed USB device number 3 using ehci_hcd
[...]
 usb 1-7: Product: USB2.0 Web Camera
 usb 1-7: Manufacturer: Vimicro Corp.
[...]
 gspca_main: v2.14.0 registered
 gspca_main: vc032x-2.14.0 probing 0ac8:0321
[...]
 gspca_main: ISOC data error: [36] len=0, status=-71
 gspca_main: ISOC data error: [65] len=0, status=-71
[...]
 gspca_main: ISOC data error: [48] len=0, status=-71
 video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in 
 cheese[8048000+21000]
 gspca_main: ISOC data error: [17] len=0, status=-71

Thanks again.

If you get a chance to test Hans's media-for_v3.5 branch, that would
be interesting.  It works like so:

 0. prerequisites:

apt-get install git build-essential

 1. get the kernel history, if you don't already have it:

git clone \
  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. fetch gspca updates:

cd linux
git remote add gspca \
  git://linuxtv.org/hgoede/gspca.git
git fetch gspca

 3. configure, build, test:

git checkout gspca/media-for_v3.5
cp /boot/config-$(uname -r) .config; # current configuration
scripts/config --disable DEBUG_INFO
make localmodconfig; # optional: minimize configuration
make deb-pkg; # optionally with -jnum for parallel build
dpkg -i ../name of package; # as root
reboot
... test test test ...

I ask because there have been some gspca core fixes cooking that are
not part of the 3.4.y tree, though none of them looks especially
relevant.

Hope that helps,
Jonathan
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Re: video: USB webcam fails since kernel 3.2

[Jonathan Nieder]

Jonathan Nieder wrote:

 (cc-ing Hans de Goede, the new gspca maintainer.  Sorry I missed
 that before.)

Actually cc-ing this time.  Sorry for the noise.

 Martin-Éric Racine wrote:
 usb 1-7: new high-speed USB device number 3 using ehci_hcd
[...]
 usb 1-7: Product: USB2.0 Web Camera
 usb 1-7: Manufacturer: Vimicro Corp.
[...]
 gspca_main: v2.14.0 registered
 gspca_main: vc032x-2.14.0 probing 0ac8:0321
[...]
 gspca_main: ISOC data error: [36] len=0, status=-71
 gspca_main: ISOC data error: [65] len=0, status=-71
[...]
 gspca_main: ISOC data error: [48] len=0, status=-71
 video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in 
 cheese[8048000+21000]
 gspca_main: ISOC data error: [17] len=0, status=-71

Thanks again.

If you get a chance to test Hans's media-for_v3.5 branch, that would
be interesting.  It works like so:

 0. prerequisites:

apt-get install git build-essential

 1. get the kernel history, if you don't already have it:

git clone \
  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. fetch gspca updates:

cd linux
git remote add gspca \
  git://linuxtv.org/hgoede/gspca.git
git fetch gspca

 3. configure, build, test:

git checkout gspca/media-for_v3.5
cp /boot/config-$(uname -r) .config; # current configuration
scripts/config --disable DEBUG_INFO
make localmodconfig; # optional: minimize configuration
make deb-pkg; # optionally with -jnum for parallel build
dpkg -i ../name of package; # as root
reboot
... test test test ...

I ask because there have been some gspca core fixes cooking that are
not part of the 3.4.y tree, though none of them looks especially
relevant.

Hope that helps,
Jonathan
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