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. So it doesn't make sense to say the data gets passed to VMWare correctly. In fact, VMWare is changing the -71 error codes to 0. > 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 on both systems. While the host sees a > PAL-standard, the guest interprets it as NTSC. How did you notice this? It doesn't show up in your usbmon traces. > #### Host #### > bmVideoStandards 0x6c > PAL - 625/50 > SECAM - 625/50 > PAL - 525/60 > > #### Guest #### > bmVideoStandards 0x32 > NTSC - 525/60 > NTSC - 625/50 > PAL - 525/60 Maybe you are using different software or different settings in the host and the guest. > Might this be the reason? This is definitely not the reason for the missing -71 codes. They are stripped out by VMWare. > Can I force the host to use NTSC? I don't know. Whatever technique you employ to tell the guest to use NTSC should also work with the host. 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
