https://bugzilla.kernel.org/show_bug.cgi?id=214021 --- Comment #3 from Alan Stern (stern@xxxxxxxxxxxxxxxxxxx) --- You can try changing the bPwrOn2PwrGood value in the kernel source to see if that will make any difference. The line to change is in drivers/usb/host/xhci-hub.c in the function xhci_common_hub_descriptor(). It's at the start of the function: desc->bPwrOn2PwrGood = 10; /* xhci section 5.4.9 says 20ms max */ The value gets multiplied by two, so if you change it to 50 then the delay will become 100 ms. However I suspect that the length of this delay is not the cause of the problem you see. The actual error occurs in the usb_alloc_dev() function in drivers/usb/core/usb.c. You can try adding some printk statements in there to see which of the "return NULL" statements is the one you're getting. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
