On Sat, 27 Oct 2012, Stefan May wrote:
> Dear Alan,
>
> maybe there is a bug in VMWare. If so, there must be either a bug in the
> firmware or in the uvc module, since the camera is not working on native
> Linux without the nodrop option.
>
> I verified the following. In uvc_video.c at line 59
Dear Alan,
maybe there is a bug in VMWare. If so, there must be either a bug in the
firmware or in the uvc module, since the camera is not working on native
Linux without the nodrop option.
I verified the following. In uvc_video.c at line 595
if (urb->iso_frame_desc[i].status < 0) {
On Fri, 26 Oct 2012, Stefan May wrote:
> I saw different bmVideoStandards with lsusb. It is the only parameter
> with a different value on both sides. Meanwhile, I found a way to make
> the camera work. I need to use the load option nodrop=1 in the host, but
> not in the guest.
> I have no idea
I saw different bmVideoStandards with lsusb. It is the only parameter
with a different value on both sides. Meanwhile, I found a way to make
the camera work. I need to use the load option nodrop=1 in the host, but
not in the guest.
I have no idea why UVC sees incomplete frames only on host side.
On Fri, 26 Oct 2012, Stefan May wrote:
> it seems that data are interpreted differently. While the host is
> getting tons of -71 errors, data is passed to vmware correctly.
That's a strange way of describing it. When the -71 errors occur
there _is_ no data -- the device didn't send anything.
it seems that data are interpreted differently. While the host is
getting tons of -71 errors, data is passed to vmware correctly.
I've attached two traces that I ran simultaneously on the host and the
guest. One thing that I noticed is that the same camera is setting
different video standards
Dear Alan,
thank you for your answer. I recorded the trace within the guest.
Tonight, I record it for the host too in order to see, if that change
happens.
Very best,
Stefan May
Am 25.10.2012 17:01, schrieb Alan Stern:
On Thu, 25 Oct 2012, Stefan May wrote:
Dear USB-Developers,
I am
On Thu, 25 Oct 2012, Stefan May wrote:
> Dear USB-Developers,
>
> I am having a strange Problem on Ubuntu Linux (11.10 and 12.04) using a
> thermal camera (Cypress FX2 chip) in isochronous mode. The transmission
> of data breaks with the error code -EPROTO. The curious thing is, that
> it runs
