https://bugzilla.kernel.org/show_bug.cgi?id=60824 --- Comment #167 from Hans de Goede (jwrdegoede@xxxxxxxxxxxxxxxxx) --- mirh, hi, interesting comment. I wonder if this perhaps is a USB packet timing issue, rather then a signal strength issue, esp. the " "hci0: unexpected event for opcode 0x0000" error that I'm only getting..." bit makes me wonder this. Your old PC was likely using an EHCI controller. Where as your new PC is using a xHCI controller, or a mix of EHCI + xHCI. There is a subtle problem with USB1/2 compatibility and xHCI controllers. the UHCI/EHCI USB1/2 controllers have a frameclock of 1 ms and when sending a new USB packet to a device just after the frame clock-tick, it will get delayed until the next frame. The xHCI controller however will send any new USB control/bulk transfers *immediately* if there is room for it on the BUs schedule (IOW if the bus is otherwise idle). I've recently helped fix support for some old USB scanners by inserting a 1 ms delay for some requests during the initialization of the scanner since the new xHCI behavior made the time between 2 requests too short for the firmware of the scanner to handle. I wonder if something similar is going on here. -- You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
