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dritan
Apprentice
Joined: 01 Feb 2006
Posts: 210
Location: New York
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 Posted: Sun Sep 10, 2006 11:11 am Post subject: webcam problem |
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hi all, i recently got a Z-Link QB320 webcam from a friend, but i cant get it working on my gentoo, i have V4L (with basically all the kernel supported devices) built into the kernel and emerged most of the webcam related buids like camstream camE etc.
i have absolutly no experience with webcams on gentoo before, according to the webcam wiki, there should be a /dev/video0 device but its not there.
here is my lsusb output
| Code: | localhost dritan # lsusb
Bus 001 Device 007: ID eb1a:2800 eMPIA Technology, Inc. Terratec Cinergy 200
Bus 001 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 002 Device 002: ID 413c:3010 Dell Computer Corp. Optical Wheel Mouse
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the webcam is the eb1a:2800 entry. i dont think this camera is supported under linux since my kernel (beyond-dev-2.6.17-git2) did not react to it, but i have the windows drivers and i remember before when trying to fix wireless there was a way of making use of a windows driver on linux, is that applicable here?
Thanks in advance
Dritan
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Dritan
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keyson
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Joined: 10 Jun 2003
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Location: Sweden
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dritan
Apprentice
Joined: 01 Feb 2006
Posts: 210
Location: New York
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| Posted: Sun Sep 10, 2006 1:09 pm Post subject: |
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thanks for the quick reply keyson,
so i built the em2800 module into the kernel but whenever i try to access the webcam via any program that program will hang, i do have a new entry however at /dev/v4l/video0, the dmesg output when i plug the camera in says this:
| Code: | [ 503.676777] em28xx new video device (eb1a:2800): interface 0, class 255
[ 503.676782] em28xx #0: Alternate settings: 4
[ 503.676784] em28xx #0: Alternate setting 0, max size= 0
[ 503.676786] em28xx #0: Alternate setting 1, max size= 644
[ 503.676788] em28xx #0: Alternate setting 2, max size= 1288
[ 503.676790] em28xx #0: Alternate setting 3, max size= 2580
[ 503.676793] em28xx #0: Your board has no eeprom inside it and thus can't
[ 503.676794] em28xx #0: be autodetected. Please pass card=<n> insmod option to
[ 503.676796] em28xx #0: workaround that. Redirect complaints to the vendor of
[ 503.676797] em28xx #0: the TV card. Generic type will be used.em28xx #0: Best regards,
[ 503.676798] em28xx #0: -- tux
[ 503.676801] em28xx #0: em28xx #0: Here is a list of valid choices for the card=<n> insmod option:
[ 503.676804] em28xx #0: card=0 -> Unknown EM2800 video grabber
[ 503.676805] em28xx #0: card=1 -> Unknown EM2820/2840 video grabber
[ 503.676807] em28xx #0: card=2 -> Terratec Cinergy 250 USB
[ 503.676809] em28xx #0: card=3 -> Pinnacle PCTV USB 2
[ 503.676811] em28xx #0: card=4 -> Hauppauge WinTV USB 2
[ 503.676813] em28xx #0: card=5 -> MSI VOX USB 2.0
[ 503.676815] em28xx #0: card=6 -> Terratec Cinergy 200 USB
[ 503.676817] em28xx #0: card=7 -> Leadtek Winfast USB II
[ 503.676818] em28xx #0: card=8 -> Kworld USB2800
[ 503.676820] em28xx #0: card=9 -> Pinnacle Dazzle DVC 90
[ 503.676822] em28xx #0: card=10 -> <NULL>
[ 503.676826] em28xx #0: card=11 -> <NULL>
[ 503.676828] em28xx #0: card=12 -> Kworld PVR TV 2800 RF
[ 503.796116] em28xx #0: AC97 command still being executed: not handled properly!
[ 503.835981] em28xx #0: AC97 command still being executed: not handled properly!
[ 505.615719] em28xx #0: AC97 command still being executed: not handled properly!
[ 505.655836] em28xx #0: AC97 command still being executed: not handled properly!
[ 505.995677] registered VBI
[ 506.015472] em28xx #0: V4L2 device registered as /dev/video0 and /dev/vbi0
[ 506.015476] em28xx #0: Found Unknown EM2800 video grabber
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i assume mine is card=6, so can i built it as a module and try: | Code: | | card=6 modprobe em28xx or em2800 |
or is there any better/easier way to work around this problem?
thanks again.
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Dritan
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keyson
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Joined: 10 Jun 2003
Posts: 830
Location: Sweden
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| Posted: Sun Sep 10, 2006 1:53 pm Post subject: |
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Yes build it as module and do a
modprobe em28xx card=6 |
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dritan
Apprentice
Joined: 01 Feb 2006
Posts: 210
Location: New York
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| Posted: Sun Sep 10, 2006 2:57 pm Post subject: |
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alright, so i built it as a module and when i tried modprobe i get nothing, seems like the console just dies there, so i checked the dmesg and i found this at the end, i tried both insmod and modprobe with and without the card=6 option but the output was the same:
| Code: |
Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
<ffffffff80245d83>{m_show+114}
PGD 3bbd0067 PUD 3a788067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: fglrx tda9887 tuner em28xx ir_common tveeprom
Pid: 6867, comm: modprobe Tainted: P 2.6.17-beyond-git2 #6
RIP: 0010:[<ffffffff80245d83>] <ffffffff80245d83>{m_show+114}
RSP: 0018:ffff81003af07e98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff81003b269fff RDI: ffff81003b269017
RBP: ffffffff880a6dc0 R08: 00000000fffffff3 R09: ffff81003af07cc8
R10: 000000000000000a R11: 0000000000000000 R12: ffff81003d309b40
R13: 0000000000000400 R14: 0000000000000000 R15: 00002afbbdc5b000
FS: 00002afbbe0c2ae0(0000) GS:ffffffff8080a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000003bbeb000 CR4: 00000000000006e0
Process modprobe (pid: 6867, threadinfo ffff81003af06000, task ffff81003d666480)
Stack: ffff81003d309b40 ffffffff880a6dc8 00000000880a6dc8 ffffffff8028f2bc
ffff81003af07f50 ffff81003e2f2480 ffff81003d309b70 0000000000000001
0000000000000000 ffff81003e2f2480
Call Trace: <ffffffff8028f2bc>{seq_read+261} <ffffffff80273056>{vfs_read+170}
<ffffffff80273432>{sys_read+69} <ffffffff80209696>{system_call+126}
Code: 48 8b 03 0f 18 08 48 8d 85 80 11 00 00 48 39 c3 75 cd 83 bd
RIP <ffffffff80245d83>{m_show+114} RSP <ffff81003af07e98>
CR2: 0000000000000000
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it says unable to handle kernel null pointer dereference, is there any other konfig in the kernel that i shoud (or shouldn't) have enabled? thanks.
EDIT: i just found out that after awhile (maybe 5min) i can ctrl+C and abort the hung modprobe command, but its the same on second try
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Dritan
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keyson
l33t
Joined: 10 Jun 2003
Posts: 830
Location: Sweden
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| Posted: Sun Sep 10, 2006 4:44 pm Post subject: |
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Hm.
Did you reboot befor trying the module ?
It seems to have worked when you hade it in the kernel.
So it should work as a module. But if you run the kernel
with the build in driver and try to load one it would fail. |
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