On Mon, 17 Dec 2012, [KOI8-R] ���� wrote: > Guys, possibly found bug in usb host controller. This is not a new bug; it has been known for many, many years. The ehci-hcd driver does not allocate periodic schedules very well for full-speed and low-speed devices. > Attempting to read /dev/video0 for USB video device gives: > libv4l2: error turning on stream: No space left on device > > The camera: > Bus 002 Device 006: ID 18ec:3299 Arkmicro Technologies Inc. > > The hardware on that machine, is ok. I also have win7 installed and > the camera works in it. > I tested this camera on other two machines with Ubuntu 12.10 and it > works out of the box (luvcview, guvcview). Actually, the camera does not seem to be working properly. Did you notice these lines in the log? [ 373.762871] usb 1-1.6: new full-speed USB device number 4 using ehci_hcd [ 373.855116] usb 1-1.6: not running at top speed; connect to a high speed hub The camera should be running at high speed -- at least, it claims to support high speed -- but it's only using full speed. > I tested it with the latest mainline kernel, the bug still exists. Yes. I'm afraid this bug isn't going to be fixed any time soon. Fixing it will be a pretty big job; it's not a simple bug. > Here is the link to bug at Ubuntu's launchpad: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1088395 > > Necessary files attached. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
