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New: Webcam: Logitech QuickCam Communicate won't work with 2.6.27

Bugme-new NAK Andrew Morton 2 participants 2 messages Oct 11, 2008 1 message not in the archive Media (V4L/DVB)

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Andrew Morton

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(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).

Quoted 18 lines · On Sat, 11 Oct 2008 10:13:36 -0700 (PDT) [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=11741

           Summary: Webcam: Logitech QuickCam Communicate won't work with
                    2.6.27
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.27
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Other
        AssignedTo: [email protected]
        ReportedBy: [email protected]
Quoted 2 lines

Latest working kernel version: 2.6.26.2 + additional GSPCA Earliest failing kernel version: 2.6.27 (with internal GSPCA)

It's a regression.

Quoted 6 lines

Distribution: Debian lenny
Hardware Environment: AMD64, Core2Duo

Problem Description:

Camera does not work!

Is it due to DVB or to USB?

Quoted 45 lines

Trying "camstream":
VDLinux::run() VIDIOCMCAPTURE failed (Invalid argument) run(): VIDIOCSYNC(1) failed (Invalid argument)

Skype:
No error message but colorful noise instead of input signal

Steps to reproduce:
Get a "Logitech QuickCam Communicate" an plug it into a 2.6.27 Kernel.

Log from a working 2.6.26.2:

Oct 11 16:16:57 heros kernel: usb 2-2: new full speed USB device using uhci_hcd
and address 2
Oct 11 16:16:57 heros kernel: usb 2-2: configuration #1 chosen from 1 choice
Oct 11 16:16:57 heros kernel: Linux video capture interface: v2.00
Oct 11 16:16:58 heros kernel: gspca: USB GSPCA camera found.(ZC3XX)
Oct 11 16:16:58 heros kernel: gspca: [spca5xx_probe:4275] Camera type JPEG
Oct 11 16:16:58 heros kernel: gspca: [zc3xx_config:669] Find Sensor HV7131R(c)
Oct 11 16:16:58 heros kernel: gspca: [spca5xx_getcapability:1249] maxw 640 maxh
480 minw 160 minh 120
Oct 11 16:16:58 heros kernel: usbcore: registered new interface driver gspca
Oct 11 16:16:58 heros kernel: gspca: gspca driver 01.00.20 registered
Oct 11 16:16:58 heros kernel: usbcore: registered new interface driver
snd-usb-audio
Oct 11 16:16:58 heros kernel: gspca: [spca5xx_set_light_freq:1932] Sensor
currently not support light frequency banding filters.
Oct 11 16:16:58 heros kernel: gspca: [gspca_set_isoc_ep:945] ISO EndPoint found
0x81 AlternateSet 7
Oct 11 16:20:00 heros kernel: usb 2-2: USB disconnect, address 2

Log from a nonworking 2.6.27:

Oct 11 16:26:15 heros kernel: usb 7-1: new full speed USB device using uhci_hcd
and address 2
Oct 11 16:26:15 heros kernel: usb 7-1: configuration #1 chosen from 1 choice
Oct 11 16:26:15 heros kernel: Linux video capture interface: v2.00
Oct 11 16:26:15 heros kernel: gspca: main v2.2.0 registered
Oct 11 16:26:15 heros kernel: gspca: probing 0ac8:0302
Oct 11 16:26:17 heros kernel: zc3xx: probe 2wr ov vga 0x0000
Oct 11 16:26:17 heros kernel: zc3xx: probe sensor -> 11
Oct 11 16:26:17 heros kernel: zc3xx: Find Sensor HV7131R(c)
Oct 11 16:26:17 heros kernel: gspca: probe ok
Oct 11 16:26:17 heros kernel: gspca: probing 0ac8:0302
Oct 11 16:26:17 heros kernel: gspca: probing 0ac8:0302
Quoted 10 lines
Oct 11 16:26:17 heros kernel: usbcore: registered new interface driver zc3xx
Oct 11 16:26:17 heros kernel: zc3xx: registered
Oct 11 16:26:17 heros kernel: usbcore: registered new interface driver
snd-usb-audio
Oct 11 16:27:58 heros kernel: zc3xx: probe 2wr ov vga 0x0000
Oct 11 16:28:03 heros kernel: zc3xx: probe 2wr ov vga 0x0000
Oct 11 16:28:19 heros kernel: usb 7-1: USB disconnect, address 2
Oct 11 16:28:19 heros kernel: gspca: disconnect complete

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NAK
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Quoted 23 lines · Andrew Morton

(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).

Quoted 18 lines · On Sat, 11 Oct 2008 10:13:36 -0700 (PDT) [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=11741

           Summary: Webcam: Logitech QuickCam Communicate won't work with
                    2.6.27
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.27
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Other
        AssignedTo: [email protected]
        ReportedBy: [email protected]
Quoted 5 lines
Quoted 2 lines

Latest working kernel version: 2.6.26.2 + additional GSPCA Earliest failing kernel version: 2.6.27 (with internal GSPCA)

It's a regression.

Nack, GSPCAv1 was never part of the official kernel, so the cam did not work *at all* with the previous official kernel, this is not a regression. Also see below about features which gscpa as in kernel misses compared to the old one, where the missing of this features actually is a feature.

Quoted 9 lines
Quoted 6 lines

Distribution: Debian lenny
Hardware Environment: AMD64, Core2Duo

Problem Description:

Camera does not work!

Is it due to DVB or to USB?

??

Its a USB cam.

Quoted 4 lines
Quoted 4 lines

Trying "camstream":
VDLinux::run() VIDIOCMCAPTURE failed (Invalid argument) run(): VIDIOCSYNC(1) failed (Invalid argument)

That is because camstream is a v4l1 application and the new gspca is a v4l2 driver. Besides that camstream does not support the JPEG image format produced by zc3xxx cam's such as yours. gspcav1 (the out of tree version) used to do JPEG decompression in kernelspace and happily offer RGB format data to applications, even though the cam does not, doing in kernel format conversion and esp. decompression is completely unacceptable, this clearly belongs in userspace.

I've written a userspace library which handles the format conversion in userspace, and which can be used as a libc library wrapper to transparently do format conversion for apps which need this. As an added bonus it can also emulate the v4l1 API on top of v4l2 devices, see:
http://hansdegoede.livejournal.com/3636.html
Download the latest version here:
http://people.atrpms.net/~hdegoede/libv4l-0.5.0.tar.gz
And see the README for installation instructions, then LD_PRELOAD v4l1compat.so and camstream should work fine. Note that work is underway to write patches for all FOSS v4l using apps to use libv4l directly so that LD_PRELOAD wont be necessary, see:
http://linuxtv.org/v4lwiki/index.php/Libv4l_Progress

Also note that the Ubuntu devs are aware they need to patch all their apps to use libv4l to work seamlessly with cams supported by the new gspca when moving to 2.6.27. I'm very certain they know this as I personally told their kerneldevs this at the Plumbers conference.

Quoted 3 lines
Quoted 3 lines

Skype:
No error message but colorful noise instead of input signal

I don't know what skype does at it is closed source, I do know many people have successfully used it with the new gspca in combination with LD_PRELOAD v4l1compat.so

Regards,

Hans

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