Empia em28xx based USB video device...

Hi all.
I have an em2821 device ( brand Digitus ) and some problems with it.
+ lsusb:
Bus 001 Device 004: ID eb1a:2821 eMPIA Technology, Inc.

I have 2 situations:
+ machine1: standard PC - kernel 2.6.24.3 - CPU AMD - 512 Mb RAM - last snapshot of v4l-dvb ( 2 days ago )
if I load the module ( em28xx ) with card=0 ( Unknown EM2800 video
grabber ) it doesn't work ( tested with xawtv )
if I load the module ( em28xx ) with card=1 ( Unknown EM2750/28xx
video grabber ) it doesn't work ( tested with xawtv )
if I load the module ( em28xx ) with card=9 ( Pinnacle Dazzle DVC
90/DVC 100 ) it works ok...
+ machine2: SBC - kernel 2.6.24.3 - CPU x86 ( like a 586 ) - 64 Mb RAM - last snapshot of v4l-dvb ( 2 days ago )
if I load the module ( em28xx ) with card=0 ( Unknown EM2800 video
grabber ) it doesn't work ( tested with xawtv )
if I load the module ( em28xx ) with card=1 ( Unknown EM2750/28xx
video grabber ) it doesn't work ( tested with xawtv )
if I load the module ( em28xx ) with card=9 ( Pinnacle Dazzle DVC
90/DVC 100 ) it works badly... I get something like an image compressed in the firt rows... ( image here: http://www.flickr.com/photos/17101105@N00/2368937536/ )

Same module parameters, same kernel config (changed only the CPU), same distro (Debian Etch). Any ideas...?

dmesg for these machines ( card=9 ):
+ machine1:

[  198.848725] Linux video capture interface: v2.00
[  198.872627] em28xx v4l2 driver version 0.1.0 loaded
[  198.872680] em28xx new video device (eb1a:2821): interface 0, class 255
[  198.872690] em28xx Has usb audio class
[  198.872693] em28xx #0: Alternate settings: 8
[  198.872696] em28xx #0: Alternate setting 0, max size= 0
[  198.872699] em28xx #0: Alternate setting 1, max size= 1024
[  198.872702] em28xx #0: Alternate setting 2, max size= 1448
[  198.872705] em28xx #0: Alternate setting 3, max size= 2048
[  198.872708] em28xx #0: Alternate setting 4, max size= 2304
[  198.872711] em28xx #0: Alternate setting 5, max size= 2580
[  198.872714] em28xx #0: Alternate setting 6, max size= 2892
[  198.872717] em28xx #0: Alternate setting 7, max size= 3072
[  198.873529] em28xx #0: em28xx chip ID = 18
[  199.894188] saa7115' 0-0025: saa7113 found (1f7113d0e100000) @ 0x4a (em28xx #0)
[  202.023636] em28xx #0: V4L2 device registered as /dev/video0 and /dev/vbi0
[  202.023647] em28xx #0: Found Pinnacle Dazzle DVC 90/DVC 100
[  202.023678] em28xx audio device (eb1a:2821): interface 1, class 1
[  202.023696] em28xx audio device (eb1a:2821): interface 2, class 1
[  202.023723] usbcore: registered new interface driver em28xx
+ machine2:
[ 4097.440853] Linux video capture interface: v2.00
[ 4097.523858] em28xx v4l2 driver version 0.1.0 loaded
[ 4097.527087] em28xx new video device (eb1a:2821): interface 0, class 255
[ 4097.529568] em28xx Has usb audio class
[ 4097.532138] em28xx #0: Alternate settings: 8
[ 4097.535497] em28xx #0: Alternate setting 0, max size= 0
[ 4097.537769] em28xx #0: Alternate setting 1, max size= 512
[ 4097.540333] em28xx #0: Alternate setting 2, max size= 640
[ 4097.542892] em28xx #0: Alternate setting 3, max size= 768
[ 4097.550248] em28xx #0: Alternate setting 4, max size= 832
[ 4097.552683] em28xx #0: Alternate setting 5, max size= 896
[ 4097.554952] em28xx #0: Alternate setting 6, max size= 960
[ 4097.558217] em28xx #0: Alternate setting 7, max size= 1020
[ 4097.563767] em28xx #0: em28xx chip ID = 18
[ 4098.712659] saa7115' 0-0025: saa7113 found (1f7113d0e100000) @ 0x4a (em28xx #0)
[ 4100.859282] em28xx #0: V4L2 device registered as /dev/video0 and /dev/vbi0
[ 4100.859513] em28xx #0: Found Pinnacle Dazzle DVC 90/DVC 100
[ 4100.859899] em28xx audio device (eb1a:2821): interface 1, class 1
[ 4100.860353] em28xx audio device (eb1a:2821): interface 2, class 1
[ 4100.860835] usbcore: registered new interface driver em28xx

dmesg when I get a frame:
+ machine1:

[  325.500770] em28xx #0 em28xx_v4l2_open :open minor=0 type=video-cap users=0
[  325.501025] em28xx #0 em28xx_set_alternate :minimum isoc packet size: 2888 (alt=6)
[  325.501129] em28xx #0 em28xx_set_alternate :setting alternate 6 with wMaxPacketSize=2892
[  325.607430] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[  325.687483] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[  325.848541] em28xx #0 em28xx_init_isoc :Submitting 5 urbs of 40 packets (2892 each)
[  325.917396] em28xx #0 em28xx_set_alternate :minimum isoc packet size: 708 (alt=1)
[  325.917635] em28xx #0 em28xx_set_alternate :setting alternate 1 with wMaxPacketSize=1024
[  326.027345] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[  326.107364] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[  326.267676] em28xx #0 em28xx_init_isoc :Submitting 5 urbs of 40 packets (1024 each)
[  326.268090] em28xx #0 em28xx_request_buffers :requested 8 buffers with size 204800
[  326.567226] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[  326.647213] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[  326.988678] em28xx #0 vidioc_streamoff :VIDIOC_STREAMOFF: interrupting stream
[  327.187180] em28xx #0 em28xx_v4l2_close :users=1
[  327.267154] em28xx #0 em28xx_v4l2_close :setting alternate 0
+ machine2:
[ 4122.561436] em28xx #0 em28xx_v4l2_open :open minor=0 type=video-cap users=0
[ 4122.564097] em28xx #0 em28xx_set_alternate :minimum isoc packet size: 2888 (alt=7)
[ 4122.566725] em28xx #0 em28xx_set_alternate :setting alternate 7 with wMaxPacketSize=1020
[ 4122.698385] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[ 4122.778116] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[ 4122.945537] em28xx #0 em28xx_init_isoc :Submitting 5 urbs of 40 packets (1020 each)
[ 4122.998140] em28xx #0 em28xx_set_alternate :minimum isoc packet size: 708 (alt=3)
[ 4123.000799] em28xx #0 em28xx_set_alternate :setting alternate 3 with wMaxPacketSize=768
[ 4123.128254] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[ 4123.208133] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[ 4123.373769] em28xx #0 em28xx_init_isoc :Submitting 5 urbs of 40 packets (768 each)
[ 4123.375432] em28xx #0 em28xx_request_buffers :requested 8 buffers with size 204800
[ 4123.698138] em28xx #0 em28xx_accumulator_set :em28xx Scale: (1,1)-(179,71)
[ 4123.778138] em28xx #0 em28xx_capture_area_set :em28xx Area Set: (180,72)
[ 4124.132320] em28xx #0 vidioc_streamoff :VIDIOC_STREAMOFF: interrupting stream
[ 4124.329479] em28xx #0 em28xx_v4l2_close :users=1
[ 4124.378950] em28xx #0 em28xx_v4l2_close :setting alternate 0

I saw that there's a difference with the "Alternate settings" but I don't know what are they... Help please !! :)

Thank you in advance...

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This one is connected to usb 2.0, so in that case it seems like a misconfigured videodecoder.

this one is connected to a usb 1.1 port .. the driver doesn't work with usb 1.1 (at least not yet).

Is there any productlink available?

Markus

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ARGH, you are righttt ! :)
Thank you for the tip Markus, very useful.

Ok, I post some info about the device for future reference:

Brand: Digitus
Model: DA-70820
ID eb1a:2821 eMPIA Technology, Inc.
Site: http://www.digitus.info/scripts/digdetail.asp?artnr=DA-70820

Module used: em28xx
Params: card=9
( Pinnacle Dazzle DVC 90/DVC 100 )
I had few tests for now... xawtv: ok... v4l2 small test app: ok... I dunno if it's stable but it seems to work.

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Mat <[email protected]> schrieb:
ARGH, you are righttt ! :)
Thank you for the tip Markus, very useful.

Ok, I post some info about the device for future reference:

Brand: Digitus
Model: DA-70820
ID eb1a:2821 eMPIA Technology, Inc.
Site: http://www.digitus.info/scripts/digdetail.asp?artnr=DA-70820

I'll try to get hold of such a device next month for going through all input options (S-Video/Composite/NTSC/PAL/SECAM).

Markus
Module used: em28xx
Params: card=9
( Pinnacle Dazzle DVC 90/DVC 100 )
I had few tests for now... xawtv: ok... v4l2 small test app: ok... I dunno if it's stable but it seems to work.

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As you prefer :)

If you need only some info / simple tests let me know. I could post the output of v4l-info if needed.

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