Hi Ondrej, On Wednesday 07 October 2009 14:59:40 Ondrej Zary wrote: > On Tuesday 06 October 2009, Ondrej Zary wrote: > > Hello, > > I have a Logitech Quickcam for Notebooks Pro camera (046d:08c3) which > > just does not work even with kernel 2.6.31 and has never worked well > > before. > > > > On http://linux-uvc.berlios.de/, there are two problems listed. I want to > > really fix these two problems so the camera will just work after plugging > > in (and not disconnect). I started with problem no. 2 as this causes the > > camera not to work at all when plugged in: > > > > usb 5-2.4: new high speed USB device using ehci_hcd and address 7 > > usb 5-2.4: configuration #1 chosen from 1 choice > > uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c3) > > uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling > > workaround. > > uvcvideo: Failed to query (129) UVC probe control : -110 (exp. 26). > > uvcvideo: Failed to initialize the device (-5). > > > > When I do "modprobe snd_usb_audio", then "rmmod snd_usb_audio" and > > finally "modprobe uvcvideo", it works. So it looks like snd_usb_audio > > does some initialization that allows uvcvideo to work. It didn't work at > > all I didn't have snd_usb_audio module compiled. > > > > What was the change that supposedly broke this in 2.6.22? > > I discovered that it's not related to usb audio at all. Doing "rmmod > uvcvideo" and "modprobe uvcvideo" repeatedly succeeded after a couple of > tries. Increasing UVC_CTRL_STREAMING_TIMEOUT to 3000 helped (2000 was not > enough). > > > Increase UVC_CTRL_STREAMING_TIMEOUT to fix initialization of > Logitech Quickcam for Notebooks Pro. > This fixes following error messages: > uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling > workaround. uvcvideo: Failed to query (129) UVC probe control : -110 (exp. > 26). uvcvideo: Failed to initialize the device (-5). > > Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> > > --- linux-2.6.31-orig/drivers/media/video/uvc/uvcvideo.h 2009-09-10 > 00:13:59.000000000 +0200 +++ > linux-2.6.31/drivers/media/video/uvc/uvcvideo.h 2009-10-07 > 13:47:27.000000000 +0200 @@ -304,7 +304,7 @@ > #define UVC_MAX_STATUS_SIZE 16 > > #define UVC_CTRL_CONTROL_TIMEOUT 300 > -#define UVC_CTRL_STREAMING_TIMEOUT 1000 > +#define UVC_CTRL_STREAMING_TIMEOUT 3000 > > /* Devices quirks */ > #define UVC_QUIRK_STATUS_INTERVAL 0x00000001 > Thanks for the patch. I wonder if it will help other Logitech users. The UVC specification unfortunately doesn't give a time boundary for answering streaming requests, so that's up to the developers. I'm pretty sure we will find at least one webcam model that will require 3001ms at some point :-) I was thinking about adding a module parameter to set the streaming control timeout. I'm not sure what the default value should be though. What's your opinion on this ? If we decide to increase the default value, where should we stop ? -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
