Aleksander Morgado <aleksande...@chromium.org> writes: > Are we sure this is not an issue in the xhci driver itself? Maybe the > specific combination of modem and xhci controller triggers some corner > case that is not fully implemented correctly in xhci? > Last time I found something similar it took me 2 weeks of reading the > USB standard to come up with the fix > (45ba2154d12fc43b70312198ec47085f10be801a).
Thanks for the pointer. Impressive detective work there. But you should know that I'm too lazy to do any hard work like that. > Did you report this at the LKML already? Maybe they have some hints on > how to best handle this. No, I haven't. You're right. This could very well be an issue with the xhci host driver. I was thinking that it might be related to the specific quirks for this old and rather rare controller. But it could very well be a generic issue too, which just doesn't show up with other implementations because theyr are more forgiving or whatever. I'll try linux-usb and Mathias next. Bjørn
