Arch Linux

Fenris

Member

Registered: 2015-07-09

Posts: 4

USB Camera 093a:2620 not working

Hi,

I have a USB camera here and I only get a black screen.

lsusb gives me:

Bus 003 Device 002: ID 093a:2620 Pixart Imaging, Inc.

lsmod gives me(only the parts I think are relevant):

gspca_pac7302          20480  0
gspca_main             36864  1 gspca_pac7302
videodev              135168  5 uvcvideo,gspca_main,gspca_pac7302,v4l2_common,videobuf2_core
usbcore               200704  10 btusb,snd_usb_audio,uvcvideo,snd_usbmidi_lib,ehci_hcd,ehci_pci,gspca_main,gspca_pac7302,xhci_hcd,xhci_pci

v4l2-ctl -d /dev/video0 --all gives me:

Driver Info (not using libv4l2):
	Driver name   : gspca_pac7302
	Card type     : USB Camera (093a:2620)
	Bus info      : usb-0000:00:14.0-6
	Driver version: 4.0.7
	Capabilities  : 0x85200001
		Video Capture
		Read/Write
		Streaming
		Extended Pix Format
		Device Capabilities
	Device Caps   : 0x05200001
		Video Capture
		Read/Write
		Streaming
		Extended Pix Format
Priority: 2
Video input : 0 (gspca_pac7302: ok)
Format Video Capture:
	Width/Height  : 640/480
	Pixel Format  : 'PJPG'
	Field         : None
	Bytes per Line: 640
	Size Image    : 115790
	Colorspace    : JPEG (JFIF/ITU601)
	Flags         : 
Streaming Parameters Video Capture:
	Frames per second: invalid (0/0)
	Read buffers     : 2

User Controls

                     brightness (int)    : min=0 max=32 step=1 default=16 value=16 flags=slider
                       contrast (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
                     saturation (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
                    red_balance (int)    : min=0 max=200 step=1 default=100 value=100 flags=slider
                   blue_balance (int)    : min=0 max=200 step=1 default=100 value=100 flags=slider
                       exposure (int)    : min=0 max=1023 step=1 default=66 value=66 flags=inactive
                 gain_automatic (bool)   : default=1 value=1 flags=update
                           gain (int)    : min=0 max=62 step=1 default=15 value=15 flags=inactive
                horizontal_flip (bool)   : default=0 value=0
                  vertical_flip (bool)   : default=0 value=0
      white_balance_temperature (int)    : min=0 max=255 step=1 default=55 value=55
                      sharpness (int)    : min=0 max=15 step=1 default=8 value=8 flags=slider
                     brightness (int)    : min=0 max=32 step=1 default=16 value=16 flags=slider
                       contrast (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
                     saturation (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
                    red_balance (int)    : min=0 max=200 step=1 default=100 value=100 flags=slider
                   blue_balance (int)    : min=0 max=200 step=1 default=100 value=100 flags=slider
                       exposure (int)    : min=0 max=1023 step=1 default=66 value=66 flags=inactive
                 gain_automatic (bool)   : default=1 value=1 flags=update
                           gain (int)    : min=0 max=62 step=1 default=15 value=15 flags=inactive
                horizontal_flip (bool)   : default=0 value=0
                  vertical_flip (bool)   : default=0 value=0
      white_balance_temperature (int)    : min=0 max=255 step=1 default=55 value=55
                      sharpness (int)    : min=0 max=15 step=1 default=8 value=8 flags=slider

If I try to view it with vlc I get:

[00007faf340010d8] v4l2 demux error: cannot start streaming: Protocol error
[00007faf340010d8] v4l2 demux error: not a radio tuner device
libv4l2: error turning on stream: Protocol error
[00007faf340010d8] v4l2 access error: cannot start streaming: Protocol error
[00007faf2c0009b8] core input error: open of `v4l2:///dev/video0' failed

If I try to open it with cheese:

libv4l2: error turning on stream: Protocol error
libv4l2: error turning on stream: Protocol error

With dmesg I get the following error repeatingly every 10ms or so while I try to view the camera:

[ 1200.915429] gspca_pac7302 3-6:1.0: URB error -71, resubmitting

I already tried:

LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so cheese -d /dev/video0

and

LD_PRELOAD=/usr/lib64/libv4l/v4l1compat.so cheese -d /dev/video0

But they didn't change anything.

Is there anything else I could try?

Greetings

Fenris

Awebb

Member

Registered: 2010-05-06

Posts: 6,611

Re: USB Camera 093a:2620 not working

Did it ever work? Did you try another USB port?

Is it an edoscope micro cam? If not you have a device ID problem. If you google for "093a:2620 linux", you will find, that others have that problem too and that it was introduced to the kernel somewhere between 2.6.32 and 3.5.

https://bbs.archlinux.de/viewtopic.php?id=27506

Search for gspca drivers and try LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so vlc. I remeber having the same problem with a microscope.

http://git.kernel.org/cgit/linux/kernel … xt?id=HEAD

Fenris

Member

Registered: 2015-07-09

Posts: 4

Re: USB Camera 093a:2620 not working

It worked under Windows XP, but under my dual boot Windows 8 there are no drivers available. I tried all available USB-Ports on my notebook and tried another notebook.

Yes it is an endoscope microcam. Yes, I already searched for those terms and found all the forum entries you posted.
As I said earlier I tried

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

With:

LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so vlc v4l2:// :v4l2-dev=/dev/video0

I get:

libv4l2: error turning on stream: Protocol error
[00007f5eb4000e68] v4l2 demux error: cannot start streaming: Protocol error
[00007f5eb4000e68] v4l2 demux error: cannot open device '/dev/radio0': No such file or directory
libv4l2: error turning on stream: Protocol error
[00007f5eb4000e68] v4l2 access error: cannot start streaming: Protocol error
[00007f5ecc000ba8] core input error: open of `v4l2://' failed

Awebb

Member

Registered: 2010-05-06

Posts: 6,611

Re: USB Camera 093a:2620 not working

I try to find the patch I used when I had this problem. Bump the tread or mail me, if I have not answered again until monday evening.

alexzk

Member

Registered: 2014-11-02

Posts: 25

Re: USB Camera 093a:2620 not working

Sorry for necro, but it seems it has 2 problems at least in 2016:
1. Camera itself works only with older USB ports (not USB 3), on USB-3 this sample check hangs forever:

auto busy_wait = [this](__u32 code, v4l2_buffer& cam_buf) ->int
            {
                int co = 0;
                while (interruptor)
                {
                    co = ioctl(code, &cam_buf);

                    if (co == -1)
                        co = errno;

                    if (co == EAGAIN)
                        std::this_thread::sleep_for(std::chrono::duration<int, std::milli>(10));
                    else
                        break;
                }
                return co;
            };

called as:
int code = busy_wait(VIDIOC_DQBUF, cam_buf);

i.e. driver do not read at all.

2. On USB-2 v4l2convert gives error, that pixart jpeg stream does not end by EOF (should be kinda black-screen on most players).

Last edited by alexzk (2016-07-05 02:59:55)