usbmon / userspace USB issues?

[itdaniher]

Running Picuntu 4.5 on a T428 stick, I've observed a handful of esoteric USB errors.

One device that works fine on my F18 laptop gives a libusb device error after being run 1+ times on the stick.

A realtek RTL2832U based software defined radio stick with librtlsdr 5f38c0519d1068c1b6354929aec73f06156f73fe returns only zeros (0x7F or 0x80) after the second synchronous read.

I am not sure these issues are related, but both are weird nondeterministic bugs with userspace libusb apps. These issues are difficult to debug without usbmon available - consider this a feature request for Picuntu 4.6?

[itdaniher]

I have compiled a kernel with usbmon baked in and begun to debug the plethora of issues at hand. Punchline is that dwc_otg has known bugs, especially when used in conjunction with USB hubs.

[aloksinha2001]

Thanks for this... let us know your results....

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On Mon, Dec 30, 2013 at 1:40 AM, Ian Daniher [email protected]:

I have compiled a kernel with usbmon baked in and begun to debug the plethora of issues at hand. Punchline is that dwc_otg has known bugs, especially when used in conjunction with USB hubs.

— Reply to this email directly or view it on GitHubhttps://github.com/aloksinha2001/Linux3188/issues/21#issuecomment-31324214 .

Alok Sinha Chief Executive Officer, Globus Eight Suite 600, 2201 Cooperative Way, Herndon, VA, USA 20171 Level 12, Tower 8C, DLF Phase II, Gurgaon, India 122002 Phone: +1-757-447-4642 | +91-9810159444 [email protected] | www.g8.net