Re: [Motion-user] vloopback problem

[Angel C. <ac...@te...>]

El dom, 23-11-2008 a las 13:39 +0000, Adam Pitera escribió:
> I am having trouble with modprobe vloopback
> FATAL: Error inserting vloopback
> (/lib/modules/2.6.27-7-generic/kernel/drivers/misc/vloopback.ko):
> Unknown symbol in module, or unknown parameter (see dmesg)
> 
> this is following a modprobe videodev (as suggested by README)
> 
> 
> I compiled release 12 of vloopback, i have ubuntu 2.6.27 (x86)

strange , i did with current stable kernel 2.6.27.7.git ( because as i
reported to ubuntu 2.6.27-7 , 2.6.27-8 has some bugs/regressions with
sata_nv).

In Ubuntu 8.10 x86 and x86_64 :

gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu11)

# svn info

Path: .
URL: http://www.lavrsen.dk/svn/vloopback/trunk
Repository Root: http://www.lavrsen.dk/svn/vloopback
Repository UUID: b3243635-062d-0410-83da-aa4e4182f756
Revision: 12
Node Kind: directory
Schedule: normal
Last Changed Author: AngelCarpintero
Last Changed Rev: 12
Last Changed Date: 2008-10-13 02:26:10 +0200 (lun, 13 oct 2008)


# make
make -C /lib/modules/2.6.27.7/source
SUBDIRS=/home/gstreamer/dev/vloopback/trunk modules
make[1]: Entering directory `/usr/src/GIT/linux-2.6.27.y'
  CC [M]  /home/gstreamer/dev/vloopback/trunk/vloopback.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/gstreamer/dev/vloopback/trunk/vloopback.mod.o
  LD [M]  /home/gstreamer/dev/vloopback/trunk/vloopback.ko
make[1]: Leaving directory `/usr/src/GIT/linux-2.6.27.y'
make -C example
make[1]: Entering directory
`/home/gstreamer/dev/vloopback/trunk/example'
cc -g -Wall    invert.c   -o invert
cc -g -Wall    resize.c   -o resize
cc -g -Wall    feed.c   -o feed
cc -g -Wall    dummy.c   -o dummy
make[1]: Leaving directory `/home/gstreamer/dev/vloopback/trunk/example'

# sudo make install

install -d /lib/modules/2.6.27.7/kernel/drivers/misc
install -m 644 -c vloopback.ko /lib/modules/2.6.27.7/kernel/drivers/misc
/sbin/depmod -a


# sudo modprobe videodev
# sudo modprobe vloopback

# dmseg 

[vloopback_init] : video4linux loopback driver v1.2-trunk
[vloopback_init] : Loopback 0 registered, input: video0, output: video1
[vloopback_init] : Loopback 0 , Using 2 buffers


> 
> 
> dmesg gives a load of:
> [40023.230741] vloopback: disagrees about version of symbol
> video_devdata
> [40023.230769] vloopback: Unknown symbol video_devdata
> etc.
> 
> lsmod |grep video:
> uvcvideo               63368  0 
> videodev               41856  1 uvcvideo
> v4l1_compat            21892  2 uvcvideo,videodev
> compat_ioctl32          9344  1 uvcvideo
> video                  25104  0 
> output                 11008  1 video
> usbcore               148848  9
> uvcvideo,snd_usb_audio,usbhid,snd_usb_lib,usb_storage,libusual,ohci_hcd,ehci_hcd
> 
> any pointers?
> 

Please check that you don't have other vloopback version installed
around or compiled with other kernels. 

- Check version of gcc ( most of times you must compile modules with
same version of gcc used for your kernel ).
- Double check you have the good kernel-headers ( linux-headers ). 


Cheers,
-- 
Angel Carpintero
ack ( at ) telefonica ( dot ) net

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